I have been using the Nokia Lumia 800 for quite some time now, just can't stop myself from basking in the glory of it!
The OS is ridiculously buttery smooth. I have yet to face any lags even with drive, music and IM+ running. While they may not be the 'heaviest' of apps. Seemingly it's is able to drive it for a clear six though.
The build quality is as good as it gets. The sleek polycarbonate unibody design is one of it's kind in the whole of the WP kingdom. The premium build quality can only be missed if you are legally blind. The glass is absolutely scratch less. No matter how many times you pull it out of your pocket, one wipe makes it squeaky clean.
I think it's time for a full fledged user review.
agreed, the phone feels really solid in hand...the curved glass just gives it a different feel (in a good way)
Dunno why some people crib that you get better hardware for the price, but when you use this, yo realize that you really don't need more..its all so fluid..
Btw, i did manage to crash the browser on my 710 a couple of times, but thats rare..very rare..