I have had my Rezound for a couple days now. Feeling brave, I loaded the leaked ICS from HTC. Everything looks and behaves essentially the same (It's still Sense afterall). But it is fast! I had spent days comparing the Nexus and the Rezound... and finally settled on the Rezound. Then it went on sale for $50. WIN!
At any rate, in my couple days of use, as an upgrade from a D1, I am blown away. It never lags. Apps open quickly, scrolling is smooth, text is crystal clear. The screen is absolutely amazing. I think it bests the iPhone in pixel density by a couple pixels IIRC... or at least comes close (I can't remember which exactly at the moment). The camera is respectable. It is probably not too far off from my $300 point and shoot camera I bought about 6-8 years ago (and it was a good one at the time).
Stock battery is respectable. I use wireless at work and home. I use widgets to disable mobile data and bluetooth when at work or home, and use mobile data and bluetooth when on the road. I leave the 4g off as the 4g at my office is spotty at best, so it just stays off almost all the time. I haven't really put it through its paces on a heavy usage day yet, but so far I'm not complaining.
The hardware build so far feels solid. It's not a heavy phone, or thick. It is bigger than I'm used to (from D1), but it feels perfect in my hands. It doesn't feel cheap or clumsy at all. It has some nice grip patterns on the back, which is nice. The screen is really sensitive though. And that's not necessarily bad... just more than I'm used to. I swear it can tell my finger is going to touch even before it does!
The only thing I miss from my rooted D1 at this point is the battery meter on the lockscreen. Everything else pretty much just works. I have had to figure out how to tweak a couple settings that are in different places than the standard Gingerbread experience, but overall, the stock Rezound experience has been extremely pleasant.
I am so glad I chose the Rezound!