I’ve just got back from the Peaks where I’ve been out for 5-6 hours on my new (to me) Surly Karate Monkey. I’m really liking the way that my 29er rides as opposed to my 26ers. It’s a bit more stable, has more traction, and is a bit more comfortable and the only price to be paid is a tiny bit of nimbleness and acceleration. I can’t see that it would be of much benefit to shorter folk (I’m 6ft) but I did see a lady riding what looked to be a 15in Gary Fisher at the Dyfi Enduro to good effect
I did mange to fall in a stream (a pedal problem) and pinch punctured twice (a bigger rear tyre and more pressure would fix that) but apart from that, the bike was lovely.
Before I got my “proper” 29er, I built my 100mm corrected 26er into a “69er” by fitting a 29er front wheel with, in my case a set of Salsa Cro-moto forks (£60ish from Wiggle) and was really surprised how good the bike rode. The only down-side is that you then have to wait for someone to sell a 29er frame and rear wheel only, but I seemed to manage.
Ron Jeremy/Norton, don’t look here It’s the same lovely chap that supplied my ‘Monkey, but this one is Black.