Haven't handled any recent production versions, but the older one I have is a nice knife. The 710 is a better cutter though, my mini-socom is rather thick at the edge.
In regards to the lock I've found microtech linerlocks consistent in that they tend to fail a light spine whack (about as much force as their own weight hitting a hard object from 1-2 feet) a few times before they lock up solid. There is no vertical bladeplay after this is done, and no perceptible wear on the locking surfaces.
For general utility I think the 710 is a superior knife in all respects, aside from the recurve being a bit more of a pain to sharpen than a non-recurved blade. The mini-socom is a really nice knife though, it was one of my favorite edc's and still was even after I got the 710, it's since been supplanted by a spyderco calypso 3 and mini-manix.