I am play-testing the TW demo with Poly, mostly out of curiosity.
I hit plenty of balls long and I mean to the fence long, but that was in the beginning with poor technique and an inability to adjust to what I thought was headlight balance.
I already have deep penetrating topspin forehands, maybe due to loopy swing. The stick did add about 10-15% more spin, but no height compared to my normal forehand, so the technology definitely works. For me the change wasn't big enough to justify switching though, I am going to stick with Prince Rebel 93 (previous generation) or go to a Head Prestige MP.