I own one.
...and it's not so bad. But, because we all like to slate products - here's it's bad points:
My phone freaks out and tells me the inbox is full when it reaches 200 text messages (instead of the 500 the specifications promise). In fact, I had nearer to 300 texts combined between my Sent Items and Inbox when it told me it was full - but the 'Memory Status' read as 200/500. Bug-tastic!
One bad thing is that it makes you pick a wifi network / data connection in the settings of each app instead of being intuitive and either letting you pick the connection you wish to use as you connect, or it should automatically 'guess' which one you want to use (ie, trying for wifi first, and then using data).
The default web browser is shite. Thank god for Opera Mini (though even Opera Mini will cause problems with people with fat fingers on this screen. Fatties, maybe carry a makeshift stylus?).
The camera is pretty good - shame it takes at the aspect ratio it does, and not the nicer 6x4 size a 'proper' camera would - but other than this, there's a wealth of useful settings. The flash is a bit harsh on just about everything, but there are enough settings to take a good photo - you just need to know what to do with them.
Widgets are nice, some pointless, but quite a lot of the ones you hope will be good are just bookmarks. Lame. What's more they have a widget to download more widgets that just takes you to a website once you've found the widget you want to download. Also lame (and hard to navigate when it's so small). I've looked into developing my own widgets and there doesn't seem to be an obvious way to submit them so others can download them ala an 'App Store'.
I can't scrobble my music from the default player to Last.fm. :(
There are, however, many things that this phone can do that are nice ideas that, say, the iPhone can't. Being able to shake the phone to get rid of the app you're using, tapping the phone (anywhere - not just the screen!) to stop and start music, the camera hardware, the tactile feedback, to name but a few.