I have a Norco full suspension mtb, size small. Sometimes I think that I should have bought an X-Small, but it feels fine when I am riding. I have dual sided pedals; spd on one side, flat on the other. Right now i ride mostly unclipped because I am finding the spds very hard to get out of. Plus, when I do clip in, my knees hurt after just a short while, compared to my speedplays I have on my road bike. But, I hate riding unclipped, especially when i start climbing. I am thinking of getting Frogs, but I am a little afraid of having to be clipped in all of the time.
I haven't ridden it too much in the last month or so... so much rain, the trails are a wreck. Today, I went for a 5 mile hike in the pouring rain, on a trail i have ridden on a bit. It is totally puddled and the tiny stream crossings are rushing little rivers. I was just starting to get confident on the mtb and now it will be like starting over again...