Hmm great phone but a few downsides:
Gmail implementation not the greatest. Emails arrive late, early and sometimes not at all. Deleting them means they stay on the server for a bit.
I also hate how you have to download images on a email everytime!! Even things like company banners. Wish emails would come through as they should be.
Whatsapp notifications not on lock screen. Likewise for Kik.
Needs more than 5 notifications on the lock screen.
I wish the status bar would remain at the top on the home screen. The Sybil's for wifi and reception disappear.
I realise these are WP8 issues and not nokia's but it's a pain :-/
I don't have a problem per say with Gmail, as I have set it up I the normal Google account method with it setup to be delivered as they arrive. That said I don't really use GMail much these days.
That's my only real gripe with the email client, downloading the pictures can be a pain but I can also see why they have done it like that. Hopefully as WP8 progresses all these little niggles get ironed out. I see the WP8 as a vast improvement over the Android mail client which I had on the SGS2 and SE Arc, the overall presentation is much cleaner.
The notification, has been a talking point on a number of forums which I used / look at. MS have gone on record and said they simply ran out of time, so that should be coming with the next update.
At a guess, once the Whatsapp gets a update it should support notications on the main screen.
What I have noticed about the 920 coming from the 800 is how loud the phone is and the overall improved audio quality, I am really very impressed with it and also means I don't have to carry around the iPad as I have been using that as audio player.
I did notice about the vibrating on the phone, its pretty vicious coming from the 800. However, I do agree it does sound a bit iffy, I am not too fussed about it.