Hi all
Big differences between the two, but both are attacking style racquets, to hit with fastest long swings in front of the body, even if on defence.
RF97A is heavy and stiff but dampened and difficult to swing. Unbelievably stable, in its own category really. Much more controlled power than Blade, balls go long easily, you need some spin to make them dip down. With the Blade you can hit flat 200% and still keep it all in with minimal effort. If you prefer flat shots with RF97A, it will usually mean that you can't swing it fast enough. Or that your swing is so fast that you can string it super tight and hit flat, but that will surely be much less common. When you can swing it fast enough then you totally need some spin for the ball to dip, and it is a racquet well suited to total spin players as well. Because of the weight you need time to get to the spot and extra time to swing back and out with all your might, and that will make you slow, and tired also, your heart rate will definitely know. Difficult to defend, same reason, but you can make good defence because when you make it you send back deep balls, heavy enough. It has a relatively high launch angle, you can easily pick up even the lowest of balls and get them effectively over the net and place them with power and precision even with an extreme grip, if your swing is not too slow. You can crush the ball effectively from many positions, even if it is not a super clean sweet spot hit, to be constantly producing heavy shots that push back the opponent. It is not easy, I would even say almost impossible to get it moving super fast on serve, even if you are a pro player. But serving is great with it, powerful, precise, constant. It is slow but super stable on returns, often just a stab or block, it is difficult to swing back and forth returning first serves, racquet is too heavy. Strings last very little, for me on the third hitting they will break in 90% of cases so I used to restring very regularly.
Blade v7 18x20 is light, even too light for me, medium soft-stiff feel but a very stable racquet, also nicely dampened and with very good feel. However with the Blade I crush the ball only with a clear sweet spot flat-ish hip level hit, whether on fh or bh (I am built approx. like Dimitrov, 1.91m/83kg, attacking style). When I catch the ball only slightly off sweet spot or I give it more spin, and it is often, lots of higher balls, or lower too, on return or late or on the half-stretch, it still a good and precise and predictable shot, and I aim deep, but can't crush the ball nearly as well or make it heavy. Then my ball is attackable, but it then changes the power balance in the point and in the play in general, opponents quickly relax and I get pushed around. For example, with a 16yo top junior, very fast but not tall or powerful but I just can't get him off balance left or right or push him back, and he easily places his shots where he wants and walks me around much more than I like. With the Blade I am very fast around the court, my heart rate stays stable and low in a long point and match, I can defend or "get unstuck" in a point easily. Much much more manoeuvrable than RF97A, although it still needs full long fast swings pretty much non-stop. You can easily constantly crush first serves with it, and have great even attacking second serve, but you have to swing it fast constantly, no slow swings when serving. Strings last more, second hitting easily, maybe even third if not too thin and used.
Backhand slice, both high or low is phenomenal both with RF97A or with Blade, but different. With the Blade I can't just block it, I have to swing back and hit it proper. Just like you see Thiem swing back to hit the slice, but Federer or Wawrinka just block it with a minimal back swing. Lack of mass is the reason once again. It is not a technically difficult thing to do, and Blade has all kinds of slice in its pocket easily, a 5* racquet for slice, like most 18x20 racquets, you can easily be very creative. But I have to swing back and hit it, not just block. With RF97A I can just block it, but slices are not so fast and low skidding as with 18x20 racquets, they are often more floating kind of balls which is not ideal if not placed perfectly, people attack them easily.
It is a recurring experience for me with lighter racquets, being pushed back. With the white Babolat Pure Strike v2 16x19 I had a similar experience concerning the weight of my shots, I just couldn't attack the way I am used to. My game was often reduced to just keeping the ball in. That was my first attempt to go down in weight, from RF97A, and K88 before it etc. And although I played with it only once, Wilson Ultra Tour is another excellent example of a good frame that is just way too light, and where constant full racquet head speed can't save the day. Blade v7 18x20 is great in comparison to UT, and they really did balance it well, lower mass with higher swingweight, and its mass distribution, feel and flex and stability are all excellent, not just good, and it's a great racquet for a huge number and type of players.
However, ordered from more to less, with RF97A or Yonex VCore 97 330g or Gravity Pro or 97HD it is always me who pushes opponents back, or at least don't get pushed back, and people notice it and convey that experience. For example, with RF97A however I hit the ball, center or off, it goes heavy, even long. But also, in the same order, as you probably know - those frames are more difficult to wield. I played for several years with RF97A , it is like a heavy train composition, and I was often late, many more unforced errors and very tiresome for the heart rate and legs. But a diamond for just hitting while hopping in the middle, you feel like Federer until you have to move haha. One of my friends I trained with, as teens for many years, plays with a RF97A. We recently played, we are very very close in level, and both play a lot, I had the Blade. He totally but totally pinned me back, I could attack a bit, but wasn't heavy enough, and he counter attacked and defended really well. Then of course he relaxed quickly and started attacking more, and he isn't lazy there. When he started attacking left or right he won all those points, I just couldn't get back into the point. Blade gives me consistency and speed around the court, but my style of play isn't "Gilles Simon", I am not really trying to just keep a solid ball in court for hours, my style is to open an attack of some kind, build the point and end with a winner or similar. If I have to defend, then my psychology is to do it with one or, if I have to, max two shots and then go back to hitting hard and attacking.
Blade v7 16x19 I haven't tried it, but simply out of experience, I have a good idea how it would play. It will be a better choice for better intermediate players and players who don't have "attack only" style. Probably a better choice for almost everyone except hard hitters who try to crush the ball with every swing.
Too much I know, sorry. If it helps someone then great. Since I had already typed most of it for another response I just posted it here as well..