I'm pretty impressed with the Bandit. I tried it on three Bucks a couple days ago.
The firsty was a standard 110. It worked well. Opening wasn't as easy as on a normal one-handed opening knife, but pretty good. You have to remember that you're opening against a bit of resistance on a strong lockback. Overall, I liked it.
The second was my PCKS 110. It has finger grooved, stag handles. This wasn't a good match for the Bandit. The stag handles make the knife noticably wider than a standard 110. The Bandit just wasn't wide enough for this knife.
The third was my Buck560. This was a match made in heaven. The excellent, yet thin grip of the 560 allowed me to get lots of leverage against the lock.
The big key to the Bandit is placement. You have to attach the stud on the correct part of the blade. If you don't get the placement right for your hand, it can be pretty hard to open the knife.
Oh yah. The set screw on the Bandit didn't make any marks on any of my knives. I didn't have it on very long, but I screwed it down pretty hard.