Good idea but bad execution IMO- fantastic geometry, descends like a dropped bomb, climbs like a goat. But too stiff at the back, by a long way. And I don’t mean uncomfortable- comfort was never an issue, I’ve got a cast-iron arse and also I don’t sit down that much. Just constantly skittish at speed on anything but smooth, even with a 2.3 tyre in it.
So, love/hate but I really don’t miss mine at all. Got a C456 to replace it and a slackener headset, which doesn’t quite have the same brilliant handling but works much better all round. (Ragley Ti gets rid of all the bad bits of the Mmmbop and is, IMO, the best hardtail I’ve ever ridden)
Disclaimer: I don’t like overly stiff bikes, it’s not the only bike I hate that other folks like. Some folks hate softer bikes.