I did, its slow and terrible next to Infected Eternity 3.0, 3.5 is even better, to bad it never had 4G.... which is the point Sense 3.5+ is accelerated by the GPU, Sense 3.0 has been taken as far as it can be and even 3.6 will be leaps and bounds better not to mention 4.0 just on hardware acceleration alone, not to mention whats devs will do with it... the Evo 3D is great and capable hardware and deserves better than Gingerbread and Sense 3.0
also ICS has better memory management and has hardware acceleration, better battery life, better task multitasking, and (i heard) it uses both cores properly since gingerbread wasn't designed for dual core cpus (ICS was)
ICS also has a large array of small features and details that make completely different. its like the difference between Windows 7 and Windows 98.
I tried ICS on the 3D weeks ago, and been running ICS on a HP Touchpad for months, its rock steady and a total overhaul top to bottom. hard to believe Gingerbread and ICS have anything to do with each other and its hard to compare them to tell u exactly which feature(s) u should be excited about.
just try it, sprint has the Nexus on display, the different is immediately noticeable