ILDiver - there are several new features - more on that later. The single biggest difference is that the F.10 is solely designed as a freediving computer. The ATOM 2.0 and GEO, while they have a free mode with a number of features designed for dedicated freediving, are limiting in that this mode was initially conceived to allow divers the opportunity to snorkel between dives. Both of these computers track nitrogen in free mode as if you were conducting air dives - and can be very restrictive for dedicated freediving.