I borrowed one (a Surly Pugley) at the weekend at the Bristol Bikefest. It was my first go on one. It was a large and probably a touch small for me.
My first impression was that the tyres seemed to squirm/roll around the rim quite a bit and I felt like it was constantly about to let go. As the lap progressed, I realised that while it did drift a lot, the noise of the fat tyres is disproportionate to the amount of slip (compared to normal mtb tyres) which I think meant I was expecting them to break away rather than just drift. With that in mind, I started to lean it a lot more and while they do move around, it’s the most controlled drift I’ve experienced but there’s loads of grip there.
Roots/rocks as you’d expect get swallowed very well – so long as you’re not going too fast at which point, you start to feel the lack of suspension.
Two big gyroscopes also mean jumping was a breeze and the bike is really stable in the air.
When rolling along the flat, it handles just like a normal bike really – no heavy steering or obvious significant drag. Unfortunately, hitting any kind of climb really made itself felt and I found it really quite hard work. With that in mind, I reckon if you were fit, you’d just cope with than and it’d be more than paid back on the downhill sections. For me, that was a bit of a downer but then maybe that’s not really meant to be their forte and you just accept that bit in return.
So, would I buy one? Right now, no though I’d happily borrow one again. If I got a good bit fitter then I might consider it differently though. That said, I’m not actually sure that I enjoyed it any more than a good ‘normal’ mtb – variety was the biggest attraction but I don’t know if that would stay the same (in the long term) for me at least.