[css771]

I have used a friend's Lumia 900 running WP 7.5 actually.

I hate the fact that apps are not retained in memory long enough. They always start over. Also, launching an app from the home screen launches a new instance instead of resuming the current instance.

Notifications are even more terrible. There's no way to access previous notifications. There's no central place where all notifications live. You can't access them from the lock screen.

Yes, all these are quirks I've found as a tech savvy user. Because of these reasons, I cant see myself ever using WP.

Besides, just the fact that you cant run unsigned applications (and there's no viable "jailbreak") is an instant turn-off for power users. So, to suggest that these people will leave Android is hilarious at best.

[meaty]

I haven't experienced the retention issue myself. My pattern of usage is to only open from the tiles. I tend to use the back button to navigate through previous contexts (hold it down and then slide left/right to pick a task/open application).

Regarding notifications; you know about tiles right? They have status on them i.e. unread count etc. A notification is pretty just a poke in the ribs to check the tiles rather than a queue of things to do.

Jail-break and run unsigned apps? Yes there is for nearly all devices - see xda-developers.com. I really don't care about this myself though. Mobile telephones have never been open platforms. Even Android is a fragmented minefield in this respect.

It's just different.