Not trying to bump this thread but I have this monitor and thought I could add some experience. Mine can pretty easily overclock to 70hz without any frames dropping, but if I recall correctly, getting closer to 80hz caused me to drop some frames. I didn't notice the frame drops in games, but online tools picked it up. I haven't had experience overclocking monitors prior to this, so I just left it at the recommended 60hz.
As for the widescreen aspect of the monitor, I really enjoy it. I'd say most modern games support it or have a mod for it. There are only a few games that I have played lately that just won't support ultra widescreen at all. What I notice more often is that games will display in the proper ultra-wide aspect ratio, but certain parts will be broken, like the HUD and menus. I think it's worth the trade off, but that's up to you. The youtuber "Wide as Fcuk" does a pretty good job of detailing what aspects of games work and don't work when playing on an ultra wide, so I always check out his reviews before buying a new game (he can be pretty harsh on games for lack of support, but he still goes over all the flaws pretty in-depth).