I still run clips and straps off-road on my MTB and CX bike. I run the straps loosely so I can blow out of them in a nanosecond. I can't seem to do that with SPD's (which, oddly enough, I run on my road bikes). The clips with loose straps still give me plenty decent foot retention, although on the CX bike it's at the expense of looking like a big nerd/Fred.
