I have owned one for about 5 years. There is no recoil, but the muzzle blast is simply astounding. It isn't a necked down 9mm, the base of the cartridge is much smaller. It's kinda fun to shoot, but it won't group like a K-38 or Model 41. About 4" @ 25 yards is all I can get out of my FiveSeven.

Just to have full disclosure, I'm not a square gun guy. They're ok for defensive use, but I much prefer to shoot my revolvers. I get it out and shoot it about once a year (usually when some acquaintance is dying to shoot one), but I shoot my K-38 every weekend.