J Kirsch
If the reviews I've seen are a fair indication, some of their guns are pretty good. Some of them... The QB78 is supposed to be a reasonably good quality copy of an older Crosman design. The quality control and finish of the guns isn't as good as Crosman's but its generally good enough. And since the guns are cheap and instructions for modifications are easy to find, they're popular "project" guns for people who want to tinker. Most of the other guns, particularly the springers, I'm not familiar with. They're probably going to be on par with most of the other budget springers available, though I think I'd rather get a Crosman, Daisy, or Gamo branded gun since they at least have repair centers you can send the gun to if something goes wrong.