For what it's worth I have the Matco on my KF7 with 680 hours of "normal use" and no issues. I'm delighted with it. A squirt of grease occasionally and check the air. I have the original kit springs and chains. I set them up equal length and slightly slack. (No tension on the springs. So I don't care if one comes off.) The plane tracks straight, steers awesome, disengages/engages when it's supposed to. I prefer wheel landings which saves wear and tear on the tail wheel. If you're a "full stall landing" style, perhaps the tail wheel assembly should be more robust. My hat is off to Mr. Matco!