I can only recommend to purchase Dive Log (DL) to anybody who owns an iPhone.
The compatibility and sync work like a charm and the (already) announced enhancements in future updates are thrilling.
DL has the potential to establish itself as the dive logger/review application for the iPhone. It's very flexible input-wise (e.g. adding missing diving gears or re-arranging selectable items etc.), just to mention one of the great features.
Give it a try and enjoy your safe dives