I just installed the 950 ROM yesterday, from previously using rooted stock and it's awesome! I can actually use home replacements now and it's not annoyingly slow. I used the Nandroid method and I haven't yet noticed any significant problems. Really the only thing that I have noticed is that it's not showing the thin silver scroll bar on the side of the screen for any of my apps. I guess it's not really useful for anything other than showing your position on a page/list, so it's by no means a deal breaker.