I upgraded about 2 months ago from a 9860.
The Z30 is so smooth over all. Battery life is pretty good,the size is just right.
There a few thing's I would like to see on the Z30.
1st- When setting up notification's I would like to pick how many times the notification ring tone you set up on text, BBM goes for. like 3x instead of only once.
2nd- When sending a BBM I would like the back button like they have for text message's.
3rd- and it's just a little thing. When you set up what kind of clock you want I would like to see one more option the old flip style clock like the 9860 has.
Other than that I would have to say close to perfect for me.:D