I have been using lumia 1020 for a year now! And well, it has the camera in the world (41 megapixel) Well, first of all there are insufficient apps and there is a lot of restrictions put by microsoft like its hardware supports OTG but software doesnt! #nadelalogic :3 You cant tweak the notifications widgets, you can only copy supported fiiles to your phone (Biggest flaw) Well, little things here and there! I had a samsung s4 before and it sucked ass! Lagged so much! I can can assure you windows phone never lags! Some apps do rarely, but you press home button and close it! Unlike android where the phone itself hangs! Also, it doesnt have multitasking! This is biggest flaw i would say! You cant open torch and go to home screen! You cant download torrent or via uc and go to home! Thats all!