I only ever used Nokia so this is my first phone from someone else. Yes Windows Phone does have the most potential but Microsoft isn't using it! Imaging being a stand out example. While Microsoft, for whatever reason, failed to launch a flagship, the competition haven't just caught up, they've overtaken. The Galaxy S6 takes images that have to be seen to be believed. They're incredible! After Nokia handed Microsoft a massive lead in that area Microsoft have squandered it. Like I've said I much prefer the Windows UI and I hope they get it together with Windows 10 for phones. The desktop version already looks incredible but the phone version feels like an afterthought unfortunately. I want them to succeed badly but I think it's going to take alot longer than everyone thinks.