The issue is it works like a hot damn. I'm a big guy, and 9mm is a light cartridge, but still in watching video of me shooting, the gun just doesn't seem to move. The slide slips back and forth, but there is next to no climb. In my opinion, the rotary unlocking of the barrel and the lack of the usual tipping of the barrel seem to smooth out the recoil impulse. Being a polymer frame, I expected the GP6 to have more percieved recoil than the Shadow, but shooting the two back to back with my ammo proved otherwise.
STI do not make the GP6. It's made by Grand Power of Slovakia. STI needed a gun to round out thier IPSC offerings, as they almost own Open and Standard division. The GP6 is an excellent choice for IPSC Production Division.
I've had mine 18 months without any issues. I had it's predecesor, the K100 for a few years before that. The guns work perfectly.