What does it offer that any other hoseless AI computer doesn't?
A lower price than the D9 and similarly tiny size.
Otherwise, same drawbacks... tiny screen, you have to look close to see, and still have to flip through multiple screens to see relevant information during the dive.
My buddy has an Atom, and while it's a fine computer, I'd buy the Oceanic VT3 before the Atom, in a heartbeat, again due to the small screen size issue. And again, my eyes are fine, it's just a matter of what gives the clearest "at a glance" view, and ease of use is a nice bonus as well.
Oceanic's software has traditionally sucked, though, so third-party alternatives (some free, some low price) may be worth considering.