There's TONS of hate for AO on this forum (although it's obviously popular in the real world). Commonly parroted reasons:
1. "A good manual is better". Why? No one really knows.
2. "You can't close it one handed". You absolutely can, it's not even difficult. Also, this complaint is never uttered against "real" autos, which are typically more "difficult" (but again, not really) to close.
3. "The spring will break!". Sure, EVENTUALLY. Except that axis locks are extremely popular, and their lock springs are far more fragile. If an assist spring breaks you have a manual knife, if a lock spring breaks you have a broken knife.
4. "It's just a poor replacement for an auto". A good AO will open just like an auto, only with a more intuitive opening motion. One could even argue that with bias towards closure, AO is safer...
5. "It will open all by itself and slice off things!". No it won't. At least, it certainly won't any more than an auto. If this mythical self opening problem is so prevalent on this forum, I really wonder what people are doing? Or how much other crap do they have in their pocket? I believe one of the reasons Kershaw used to ship all their AOs tip- down was to keep the spine of the blade secured against the pocket seam anyway, assuaging this non-problem...
Fact is, no manual, no matter how "high quality", will open as easily and reliably as a good AO. Everything should be available in speed safe!