Been using lumia 800 for about a week now. So far so good. Coming from iPhone, iPhone 3GS, iPhone 4 then to Galaxy Note. What I can say is after using Galaxy Note and change to Lumia is that the screen is tiny . But got used to it already. Its very responsive and stable. The last windows phone I used was Samsung Windows Phone 6.5. Windows Phone 7 is very different. Didn't regret changing as it is in my opinion as stable as iPhone and there's no force close like I experience with Galaxy Note and I didn't root it. The social integration is really cool and the apps collection is enough for me.