I have two semi automatic air rifles and one semi automatic pistol. A Semi Auto Maraude, a Sidewinder compact and a Hatsan Velox. All three are in .22. I have several thousand pellets down each and have had no issues with either rifles or pistol. The only issue was with a couple of SAM magazines that had too light spring tension. This caused the magazine not to advance the next pellet fast enough to mate with the cycling of the rifle. I tightened the spring tension on both and have had no issue since. As stated above, they all eat pellets. You can go through a tin in no time flat. Positive side is that you have an immediate follow up shot if needed on any varmint you are trying to liquidate. It is also much quicker to get your scope, red dot, or other sighting mechanisms back on target quickly. This is a real plus if the target is moving quickly, jumping from limb to limb.