I haven't had as many issues as some of you have, but I do notice the OS just pausing for a few seconds sometimes that I find annoying - especially when I'm opening up something from the Social Feeds screen.  The other thing I wish is the messages screen - there should be a way to set the list so that each email takes one line - like I had on my Bold.  I get way too many e-mails and would like to see more of them on the screen.  I am using the Bold 9000 case which works well - the magnet in the case will put the phone to "sleep" mode if you face the screen toward the back of the case.  But these are the only things I've noticed so far.  Everything else has been fine (so far) and I do like the phone - but it takes getting used to from my Bold.  I am not able to speed through my emails like I was able to on my Bold.