I just bought my feedneck a couple days ago because the place I went to didn't have the Q-lock. To be honest, I wish I would have waited to get a Q-lock because the Shocktech is not as easy as it looks to use. First of all, I tightened it on my hopper (finger tight as hard as I could) and my egg would still spin with relative ease. By the way, tightening this thing with your fingers actually hurts because of the poorly designed nut. It needs to be tightened with a 3/32" allen if you don't want it to spin. After about a dozen times removing and re-tightening my hopper, I went to tighen it down again and the finger nut acutally came loose from the screw rendering the neck useless until I was able to locktite the nut on the screw, wait a day, and then re-tighten the feedneck. It's kind of hard to explain, but Shocktech should have made the screw and finger nut in one piece. All I can say is, thankfully I was at home and not at the paintball park or I would have been even more angry. On the positive side though, I don't think there is a cooler looking, or lower profile feedneck on the market and this would be good for shorter players or someone who plays front.
Hopefully the next generation of Shocktech feednecks get a lot better (their new drop-forwards are awesome), but until then, I think I will buy and recommend the Q-lock.