For those of you that do a mix of off-road, road biking & commuting on your cyclocross bike, what clipless pedals do you use and why?

I run Shimano pedals on my mountain bike that I like a lot (picked them up used for only a year, from a coworker for only $10, they're Shimano PD-M515). I like the spring adjustment and I'm thinking of getting an extra set rather than switching the pedals over constantly. But I'm curious what everyone else uses and why.