I've owned several Operators al and carbon. That are not light bikes...but I'm 190lb aggressive rider/jumper and have never had an issue with one. Good handling but not the best either. As compared to my M9 the Operators are more of a "fun" bike. As compared to a more "race" bike. Much more jumpy though.
Also you may want to go to the Kona section in the forums for more owner feedback.
I really like my 2014 carbon operator, rides really well, upraded a few of the stock parts like suspension and wheelset, and it made the bike ride even better. I would really like to try out the 27.5 version some time soon.