I have both.
The Ambush is a big knife, very sturdy, the aluminum handle feels solid in the hand. But the detent ("In Draft") is very stiff; I can open it just fine, but after getting used to Axis locks, it's a bother. The Rolling Lock works well otherwise, though; locks up solid, and mine's not prone to sticking like my REKAT Carnivore.
The Snipe was a big disappointment to me. It's also a big knife, but the blade is pretty thin for its size, and the scales feel incredibly thin and cheap. The lock works well, though.