I recently purchased this CRKT Carson M16-13LE folder from Grand Prairie Knives (http://www.gpknives.com/). Delivery time was 5 days, and the price was right, $45.00, which is about 50% off retail. The blade is shaving sharp & locks up tight with no play or slack and the liner lock is easily manipulated to fold the blade. Overall, this is a very high quality knife.
One handed opening is easy by using the thumb stud only, or by partially opening the blade with the "Carson Flipper" (that's the round projection on the base of the blade) then using the thumb stud to finish opening. Either way works. The "Carson Flipper" is supposed to make it easier to open the blade when wearing gloves. It does work.
One last note, this knife is last year's model (which probably accounts for the discounted price), consequently it does not feature what CRKT calls the "LAWKS" safety system, which is supposed to aid in blade lock-up. Maybe it does, but it also adds more parts. I figure the fewer moving parts in a folding knife, the better, so I'm completely satisfied with this knife as is.