Nice bike, gives me bike envy.

I haven't used clips/clipless pedals on a mountain bike but on the road my pedaling is a lot smoother and my legs are a lot less tired even though I'm going faster. It's very interesting. I'm not a great mountain biker yet (a n00b) so I don't trust myself with toe clips or clipless pedals on single tracks (all of them around here have lovely rocks and ruts I take completely wrong haha) but for nice trails I would have no problem with them for speed. It just depends on what you want to do .