I have a BM 10520 Offsider (First Production Run), and I LIKE IT! Since it's a "fighter", and I haven't been in any knife-fights since I received it, I haven't really tried it out or used it. I've held it quite a bit and went through some "drills" with it, and it feels excellent in the hand (although the handle "scales" could be just a tad thicker for my large hands).
As with all the Benchmade knives I've had, this one is very sharp, and the grinds are excellent. The sheath is also good, but I wish it was set up for IWB carry.
In short, it's alot of knife for the price.