Ok, played with it long enough to say something: here's mine.

First Impressions:
Wow! Just WOW!

I am loving:

Call me shallow but I love the screen and the appearance. The way that icons move at a slightly different speed from the background creating a vaguely 3d effect and the way things explode in a little puff of fairy dust when you close them.

More seriously, I love the always on-ness. being able to pick it up in the middle of the night and check my email without having to connect or go through a pile of processes. Same for checking my twitter - or browsing here if I can't sleep!

The screen is awesome, and the browser viewing full webpages is lovely. Yes, there's a little big of rendering, and I haven't even tried youtube yet! I love the 'back button to go through your history.

I love the fact that having played with it for about 6-7 hours so far, I haven't even begun to scratch the surface of what it's capable of. The list of things Still To Try is longer than the things I've tried!

I am struggling with:

Playlists. I know they're possible, but by the time I got there last night I was already powfagged and my bear brain simply couldn't get it. Will try again when I'm more awake!

The touch screen being almost too sensitive. I keep clicking when I mean to scroll. Anyone else struggling with content-rich websites not having an inert point you can use to scroll on? (Like the forum page here...)

A few things I'd like to see: individual ring-tones (yeah, there's a brainstorm) and more customisable alarms - I can set a tone and a snooze duration, but it applies to all alarms. I can't choose a different tone or snooze for a different alarm (like something gentler to wake me at weekend)

Or or two other places where the UI is... less than obvious.

Problems:

Only problem I have encountered so far has been a few browser hangs. The system kindly suggests; "The web is not responding. Close?" - a couple of seconds and I was back browsing. Happened using the 'back' feature, especially if I wanted to go back a couple of pages. I may be being impatient, too.

Not yet tried

Most of it!
FM radio,
Camera (It arrived too close to dark o'clock)
Most of the apps I d/led.
You tube


Overall:
Brilliant. Just wish I could take a week off work to get to know it properly! I really, really feel for the guys who got the odd duds (Yeah, we know there's never a 'zero fail' rate, but it must suck to be one of the ones with a problem) but mine is so far exceeding expectations. Off now to see what happens when i switch to GPRS from the wifi!