My only regrets are are the direct conflict with Motorola Phone Tools to export contacts, (or maybe it's me who is not able to export my directory properly), in short I had to redo contacts families, and special fields.
And a smaller more autonomy than standard phones (two days) but I think this is normal.
Brightness limit for reading in direct sunlight.
Most are:
A good robustness and ease of cleaning
Android applications that allowed me to replace in large part on the Sony Clié SJ30 my organizer, and yes I am very conservative.
Accurate Gps
A large screen for my flagging eyes
A dark and understated style
So a very positive general opinion.