Those used to Androids ( eg me) will find the apps quality is worser besides lacking in variety.
Overall this phone smoothness loses to say XZU, HTC One Max, Note3. As I used the browser a lot all the browsers I tested failed me vs say Boat, Dolphin , Stock internet in Android. All browsers I tested displayed slight jerky during scrolling
Major issue I dislike is Microsoft protection of its files. I have yet to find any file manager/explorer app that can fully access even my ext sdcard. All apps I tested are all half baked solutions. Most app developers apologize for this defiency when you launched it n suggest renaming files!!!