I just upgraded my blackberry... I haven really noticed much diffrence in terms of battery consumption or speed (If you think the 7520 is slow try a 7100t...
). How ever I did notice this:
My bluetooth headset (HBH-660) is consiterably louder. I prior to the upgrade I had to use the headset with the volume turned all the way up. Now, while set at the highest volume it hurts my ear a bit.
In the address book I there is an option to read from sim (This might have been here but just never noticed it).
The calc is a bit diffrent
I will edit this post as I find new features/bugs