I wish to share different experience with two K1's, one in .25 and one in .22. I have over 4K pellets through the .25 with only one jam and that was because I forgot to flip the loading lever back to the shooting position and the magazine did not index after my first shot. Easy to clear, and a lesson to pay attention. The .22 is newer, and I've zero issues with over 1K pellets. I was told by NewEnglandAirGuns to be sure to spin the mag a few times before closing the lever to be sure nothing is hanging up. Also, keep the plenum regulator over 16MPa in .22 and 18MPa in .25 to ensure proper cycling. (JSB pellets in all cases).
I'm sorry that you had a bad experience. I've (and my son's) shot full mags as fast as I can pull the trigger and, yes, semi auto is awesome.
What blows me away is how easily I can, with a few clicks of the power wheel, change from 6 or so FPE to over 90 with no adjustment other than the wheel. I'd recommend the K1 to anyone, but your MMV.