I had a brief 30 mins hitting session against a 4.0 player, with a Vantage 90 70 flex, 27.25, 330 10 HL, original Vantage string @ 58 lbs. The whole spec. is actually very very close to my dream spec. except for the unstrung 10 pt HL balance, which results a bit higher SW than what I want. Still, I got into the glove very quickly. Here is my impression from hitting groundstrokes, sorry no time to serve with it:
The small headsize and *firm* flex of the racquethead, results a very solid and clean feel on impact. The stability is good, kind of remind me the stability of Pure Control and HPS5.0. While the throat does feel as stiff as 68 + to 70. However, I have to say, this racquet is not harsh to hit with. The overall feeling resulting from the high stiffness is a firm, soild, clean feeling and very littile vibiration even on off centre hit. The feeling on ball impact is a bit different from say, 6.0 85, 6.1, Prestige Classic, which all have a mix of other material. The Vantage is pure graphite ... hard to describe the difference for me. Anyway, it feels real soild.
On forehand, however, the stiff throat does affect imparting spins. I have to shift my grip from in-between eastern and semi-western to a bit more semi-western and adjust my swing in order to get more spin. Especially for low fast pace ball, I have a hard time to impart enough spin to the ball to get pass the net. I believe it can be improved by lower the string tension or using a thinner string. Other than that, everyting on FH and BH is good. Good power, more powerful than other classic thin beam small headsize racquet. Very good directional control. Swings a bit lighter than I expected. I hit my single BH very good with this bat.
Others: same experience as other vantage user, hit like a more forgiving 90, more powerful than usual midsize racquet, swings a bit lighter than its spec suggested.
If you are an attracking all courter, sure you'll love the combination of small headsize, open pattern and firm stiffness. Just pick your right length, weight/balance and very importantly a comfortable grip. Then enjoy hitting the court.
P.S. I just order 2 Vantage BUT with 63 flex looking to get more feel. But I just found it is more demanding and less stable to play with for me. I'm a Wilson guy and long time user of 6.0 and 6.1. So I'm selling these 2 and going back to 70 flex. A soft string at high tension plus a damper on the 70 flex will make the whole thing works our beautifully. Hope this help.