I've had a Bolt Action for years, never a bit of trouble with the lock. I like the blade shape and grind, and the ergos aren't bad. Not exceptional, but not bad. The pivot pin had a couple of glued on covers which have parted company with the knife, but that doesn't bother me. It still has absolutely no blade play to this day, and locks up good and solid.
I sometimes use the method of opening you describe... pull back the bolt and flip it open. I do this simply because of the lack of thumb stud, and I only do it when I have to open it one handed. I got no problem pinching the spine and pulling the knife open two handed-wise.
I don't particularly care for the Chameleon, bolt action or no. I don't like the design, and I don't like the little plastic bolt that's on there. This is just personal stuff, mind you. I'm sure there are people out there who are happy with it.
Wish they still made the Bolt Action. I'd buy another one.