I have played tennis and squash in the Evo, Neo and Aqua models. The Aqua is very low to the ground and comfortable. The Evo and Neo have a slightly thicker and narrower sole, so they are slightly less "barefoot" feeling. But they have better traction, if you play on clay, and more durability because of the thicker sole I would guess. By the way the Aqua is now called Aqua lite and is more light weight than the old model. Hope this helps.
Wilson PS Classic, Gosen OG Micro 16, 26 kg.
Last edited by Povl Carstensen; 02-16-2012 at 10:50 PM.