Moved to the general Android forum.
I have a One S on T-Mobile right now. I can't speak for the One X, though it's supposedly a slight step above the One S. I find the One S to feel very solid. It has a tighter feel than any previous phone I've owned, even the Razr/Maxx - and the *only* reason for that on the Razr/Maxx, is every one I owned had a loose feeling volume rocker that always rattled when the phone did. I know that's not every Razr/Maxx, but I had a few, and it was on each of the devices I had. The One S is very thin, but feels really solid to me. It definitely beats the Rezound, Thunderbolt, Inc2, and Sensation from a standpoint of feeling like a solid, unified unit. Never had an Evo, but I've had those other four.