I have carried a number of different benchmades and have yet to have an issue with them. I have an early production run Ritter Grip that I carry and use, and a 710HS that I carried and used pretty damned hard.
The 710 saw daily pocket time, and usually daily use, in my warehouse job for over 4 years. It's sat in my toolbox (dust, grime, wood chips, etc) and has yet to ever give me a single problem.
I have an early production 770 that I carry much more than I use. It's my 'evening' knife. I tend to sit there and flick it open and shut almost unconsciously, so it has been cycled thousands of times over the years.
I carried an 835HS for a few years. No, it's not an Axis lock, and the handles are Zytel if I remember corrrectly. The blade stood up to a crapload of punishment though. I never had a major issue keeping an edge on it unless I hit something like a hidden staple.
Mind you, these are all knives from a few years back. I haven't carried or used any of their more recent models, and I have heard of some issues more recently. The one thing that hasn't changed is their Customer Service. If something does need to be fixed they are top notch in trying to make it right. Some people will never be pleased no matter how much is done for them, but for those without a personal grudge, they'll fix us up every time. If one of my springs does eventually break, it won't stop me from carrying, using, and trusting that knife once it's been fixed after the years of trouble free service it's given me.
Just my 2¢ of course.