Have had Nokia Lumia 800 for a while now. Lovely phone. Fits just right in my hand, has a nice feel to it. Definitely a solid device and a beautiful too. Down-point for me is the camera quality (come on Nokia, where is your flagship camera gone?) and the unfinished OS. Not automated enough automation (selecting multiple items, working with copy/paste etc.) compared to Android. Lack of apps too, big time. Has strong GPS though. Locks in 1-2 sec outside every time and good to go.
In other words it's a business phone not a toy like an Android or iOS. Feels and looks the business. If the public will be patient enough (doubt it) it will pick up and become a strong competitor to iOS and Android (we need one). It's a windy road though for Nokia and others embracing Windows OS.