Picked up the experimental frame from the stringers today and hit for an hour with my son. He hits full western, big loopy ground strokes that leap from the court. His pace is actually lower than his younger brother as a result but timing and positioning against his shots is tougher as they spin, curve, and jump so much. Frame: Pure Storm GT modified to SW 330 Mains: VS Longevity @ 57# (NOT pre-stretched!) Crosses: Pre-Stretched Focus Hex 1.23 @ 52# In this case pre-stretching means, "kill it". I told the stringer about the experiment and asked him to pull as hard and as long as he could. He cut the string into two 20' segments so the second half would be safe for later use. The pre-stretched segment survived the extraordinary abuse. After hitting a bit with the modded frame I stripped off the tape in the head to reduce the SW to somewhere around 317 or so which was that frame's unmodified SW. Of course the extra heavy Shock Shield grip and silicone in the handle remained. SPIN Spin is mostly a function of RHS and technique. Hardware can enhance spin but technique must be sound. There's evidence that low friction between mains and crosses enhances spin and this hybrid exhibit extraordinary low friction. The mains slide silently and smoothly over the crosses. This was probably the most spin-friendly setup I've tried. There were two very clear bits of evidence for this and both pertain to RHS's role in spin generation. Generally, faster RHS means more spin. But faster RHS also means less accuracy and consistency. With this hybrid I was able to swing slower and still generate very effective topspin to drive the ball into the court and then see it leap a considerable distance and height off the court. There are two strokes that I personally struggle with when trying to hit with topspin: my one-handed backhand and my kick serve. On the kick serve I can generate great spin but my lack of experience means controlling depth is difficult. On my one-handed backhand my timing can suffer when trying to hit with extra topspin. In both cases this hybrid provided enough spin access that I could slow down my RHS, thus increasing my accuracy and consistency, while still generating very effective topspin. I suppose it's like using a powerful frame to generate higher pace with a slow stroke. The hybrid allowed my to generate accurate, consistent topspin with an easier-to-hit lower RHS. Given my past experience with Focus Hex I'm not surprised that it's spin friendly but I am delighted at how much the spin access was enhanced. This "lower speed spin access" is a keeper since it augments spin primary benefit: larger margin for error. I was able to hit the ball higher over the net and still inside the baseline/service line using topspin at much lower Racquet Head Speed. COMFORT This was the biggest surprise. Conventional wisdom is that pre-stretching poly would kill it. Un-pre-stretched Focus Hex becomes uncontrollable over time. Other polys become painful. In this case that famous MSV comfort was fully intact. The best indicator I can give is my son's comment when he tried the frame: "It feels like a pillow". This hybrid was far, far more comfortable than either fresh or aged Luxilon 4G. I did not expect this at all. CONTROL & DURABILITY I put this two together because both are TBD. Focus Hex crosses provide good control initially but this drops significantly with age. The pre-stretched FH provided control as good as or better than 4G. The question is whether or not this will be true with the pre-stretched FH over time. In theory tension loss should be low enough that control will not suffer. I should have a good idea by Monday night or so after team practice since FH control can drop pretty fast compared to 4G's extraordinary longevity. FEEL Normally I'm perfectly happy with muted setups. I like hitting with a pillow! But this might be one downside to the setup. Even for me on touch shots I felt like I couldn't get a feel for the ball. I executed just fine (Take that EDWARD!) but there was less connection to the ball compared to even the very stiff 4G. On the other hand the stringbed had a bright, exciting pop compared to my VS/4G frames. It's difficult to explain, especially in light of the fact that the FH frame felt lower powered than the 4G frames. It's truly a paradox that I can't understand. At low speed touch shots there was less feel. On high speed impacts there was a delightful pop, especially on flat shots. Weird! HIGH SW versus LOWER SW Hitting with the two swing weights was a fun last minute experiment. The setup felt even lower powered than VS/4G. And there was so much spin that even with the higher SW frame shots remained in the baseline. OTOH, the lower SW frame felt really great too. Sometimes I've felt that lower SW frames can make it harder to generate spin. When I first acquired these PSGTs I HATED them unmodified and wrote that I couldn't recommend them unmodified. But even without the extra lead in the hoop I had tremendous fun hitting with the lower SW version. I still feel like it needs a wee bit of augmentation but maybe only to the low 320s instead 330. More to come as the jury is till out on durability and control over time.