Just been out on my C456 after a few rides on the (29er) Buzzard. It was great - felt like a BMX, really nippy. A new steep, slow, nadgery tech section that was tricky on the Buzzard felt peasy (admittedly, partly due to narrower bars on the 456).
Don't get me wrong, I'm not saying one's better than the other. Actually, what I'm saying is it's great to have both and be able to swap between them. They both have strengths and riding one then the other helps you to appreciate both of them.
God, I'm a lucky sod.
Three cheers for great bikes (and, yes, a choice of wheel sizes)!