I've been using MIUI for a week or so now. Impressions are good so far. Certainly seems snappier to use and the new interface is a refreshing change. Not a massive difference in battery life (perhaps a shade better) but it's not meant to be a power-friendly ROM. There are others out there which have kernels specifically designed for squeezing out as much juice as possible from the battery if that's what you're looking for.
All in all, it was worth doing it. I've had mine rooted for a while and have been waiting for a decent ROM and this one seems pretty good so far!
Sorry for all the questions matey, you say that you've had your phone rooted for a while, what ROM did you use when you first rooted your phone then? How long did it take you to root it? I just want to get rid of all the stock apps that I don't use, so is there anything that can do that without having to root my phone?
Cheers matey
Edit
Oh & I dont seem to be able to quote other posts now, am I doing something wrong?