This is the first smartphone I have ever owned, so it's all new and exciting to me still. So far I love how easy it is to navigate around the device, the personalising it to your specific requirements and the little added extras like locating on maps where one of your contacts are. Useful for me as I have no sense of direction at all
I also love the fact that the phone is miles faster than my laptop...but I guess that's just cos my laptop is ancient.. :/
My main bugbear though is, surprise surprise, the battery life. Fortunately I don't send or receive enough mails or any other office related docs, to warrant it a major problem, but I can sympathise with those that use the device a lot for work. Even after doing the 'charge up completely, and die completely' routine, it still doesn't last a day for me, and I hardly do anything on the phone (a few texts, a little browsing, and possibly 10mins on a game). Knowing I need to take a charger around with me everywhere, just in case, is a little annoying.
Apart from that, and apart from maybe a HDMI port and a kickstand (yes, I'm sad, and wished I had an Evo!), it's probably the best...and most useful, mobile I have ever owned.