Actually, the Gibbon X is quite a bass heavy speaker. Read for instance the review at parttimeaudiophile.
I auditioned the Gibbon X in what was a pretty generous sized space and found the bass region very deep but unfortunately over-bearing. Just too much. Wheres in the same space the O/96 speakers sounded rich but pretty well controlled in the bass. The Gibbon X's bass response left me with the impression it would be one of the trickier speakers to integrate in to a room (especially one that wasn't large).
The mids and soundstaging were very nice though. Clear and warm-toned, with I think a bit of that upper bass/lower mid leaness.