I kind of half loved, half hated my mmmbop- the geometry’s fantastic but I didn’t get on with the sheer stiffness of the thing. I don’t mean comfort, that was fine, but it constantly pinged and bounced off things when going fast, it was a bloomin handful. Some folks like that though. I replaced it with a Ti which I still have (Scotroutes’ fault), absolutely love it. Outstanding downhill, but also a randomly good technical climber.
Also had a C456 (not a steel one, tried it and thought it was just lumpen) and with an angleset in it, it was pretty good- almost as good handling as the Bop, and lighter. But as standard it just didn’t inspire me at all, it’s not an especially good climber or descender, it just sort of muddles along being adequate.