Enjoy mine (Lumia 820). It is however missing a notification centre which may or may not bother you, but having come from ios previous I do miss that aspect. Yes you have ‘live tiles’ which update to show missed actions however if you don’t have that particular app pinned to the home screen then you’ll get a sound notification but you’ll be scratching your head wondering what from! This is apparently being rectified early 2014 with the wp8.1 update.
I would say go on the windows phone site and have a browse of the app store and see if it has what you want. Its currently missing some of the bigger apps and most notably an official youtube app whilst google and Microsoft argue among themselves however there and great 3rd party apps such as metro tube that do a great job of filling the gap. Likewise if you use instagram that’s not currently available although it is being released shortly, however there is 6tag which blows the official apps away.
There’s plenty of alternatives for the few missing with official versions coming all the time.
The only app with no support seems to be strava, but i grew bored with that anyway!
Anyway, great phones but if your an app whore and must have the ‘in’ game/app straight away you may be disappointed,if your not bothered by that then they are great and well worth a look.