I, like you, was a bit concerned about QC before I ordered a 7b just before Christmas. Murray Haday at Proedge brought in somewhere around 8 and gave me what he thought was the best of the bunch. He said there was not much to choose from between them, however...
I have not couned the number of times I have opened this knife in the last 3 weeks, but it must be reaching 1000 soon, most of them waves

contrary to some reports, it is a very fine knife:
1) it locks just a titch to the right of centre (started out 1/3 of the way in, but has settled down). Position of the lock does not change whether it is eased open or rocketed open with a wave.
2) the pivot bolt does not loosen at all, though I have been gradually tightening it (total of about 1/3 turn now) as the knife beds in
3) there is zero, 0, nada, nicht, NO play in the knife when it is opened and locked...it feels like a fixed blade knife.
4) if this is the knife you want BUY IT!!! If there is a problem, send it back and get it rectified. The only thing I would do is try to find one with the least amount of lock engagement, then do lots of openings to get it to bed in.
5) if you don't want to spend money DONT BUY IT as I now want to get a Commander, and maybe a SARK, and maybe....
Clinton