Pretty impressive. I had a custom 10mm barrel for a Thompson Center Contender back in the Bren Ten/Colt Delta Elite days, but never went beyond that. Essentially, they offer the ballistics of a .41 magnum load in a 5-inch barrel autopistol. I've never worked with one extensively [the large frame glocks don't fit my hand real well either, or I'd still have my old Glock 21- the 9mm/.40 frame versions work better for me, but a lady friend has kind of attached herself to the last of my ugly Glock sisters, a 9mm model 17.
I was in Beirut, Lebanon in the mid 1990s and observed and handled but didn't shoot an AK 47 that had been converted to a 10mm SMG. It had apparently been a status piece for a local gang leader who'd had a Colt Delta Ten. They got him with an RPG-7 in his limo. I don't expect he had deer hunting in mind for it, and they weren't legal for that in Indiana at that time, either.
The Auto Ordinance was considerably better than their .45 of the same time period. Probably because they needed to be more careful with the construction. I think they had both cast slides and frames but still seemed fine.