Nope, but that's because my commute is nearly 100% rural. Front end collisions, left crosses, etc, are simply not a concern. There's just no place on my commute where they could happen.
I *do* run my Dinotte 140L whenever I'm rolling. I know for sure it makes a difference. I just ordered a MagicShine taillight because I'm sick of charging up the AA cells on the Dinotte, and the MS will run off the same battery as my MS headlight (I'll be putting my Dinotte up on the for sale board cheap assuming the MagicShine works out).
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Work: the 8 hours that separates bike rides.