I have a Benchmade 5220SBK, which is their "Griptilian" line, axis lock for first responders. Very solid, strong spring. The lock release is also the blade release, which tickles my "design efficiency" nerve.
I don't carry it mostly because recovery isn't as graceful as a non-automatic knife.
Colorado made them legal to carry this year. I like micro tech out the front knives.
Does state law prohibit city from enforcing stricter laws? Last I checked, Denver was pretty bad with their knife restrictions.