The idea of changing the geometry is well enough, but that it requires the rider to stop and change it manually on the trail. That'd be a no-go for myself. Stopping on the trail, adrenaline pumping, fumbling with the bolts ..... not practical for my sensibilities. If it could be done on the fly seamlessly while riding that'd be another story. Still though, I suspect I'd simply choose one setting as when I'm riding I really don't want to be thinking about the bike.