I know two guys with guns in this caliber. One of them has a 9x25 IPSC Hi Tech Racegun (which he never shoots anymore) and the other has a 9x25 standard gun (which he converted over to 40cal so he never shoots the 9x25 anymore).
It's a brutal cartridge; I found it painful to shoot. I wouldn't bother getting one. First of all, it's hard on the shooter, and it's hard on the gun. Second, it's expensive. 10mm brass is hard to come by, and you end up having to use large pistol primers. While large pistol primers are no more expensive than small pistol primers, I'm a bit biased because I only load .40 and 38 super, both of which use small primers.