i went from nexus, to evo3d, back to nexus. after using a aosp evo 4g for months, then using the absolutely perfect (imo) nexus s, i just smitten.
however, a defective screen made me weary, so i switched to the 3d just to see what the fuss was about. nothing on the 3d kept me hooked. games felt the same, all my apps felt the same. i never saw the use of dual core. the higher res screen WAS nice, but that's about all i saw with the evo that i would keep. i did like the form factor, it was nice in the hand, and the camera button was nice. however, 3d is just a gimmick. i used it, maybe 4-5 times in the week i had the phone.
in the end i switched back to the nexus, just because i love the battery life, i love the screen, & sense doesn't make well, sense to me anymore. gingerbread has really stepped up and bridged that gap between hardcore user, and noob to android.