First, the calendar is very good, I don’t see any problems, yet. The mail area is quite good too. Now for what I see as problems. The contacts I think should contain Phone number and address. Instead of having to click on the " more" button the " state/county" should be visible by default. The contact preview should show at least phone number and address. I am holding off using eMail Client until these items are addressed.
I know why this is, I think. Didn’t eM client originate in Europe? Great setup for there. Perhaps a switch in Settings | Contacts for default region or country to enable specific dialogs for each.