I've got a couple white ones and a couple red ones. Used 'em for emergency lights when staying in a strange hotel on the road, or just to see when I got up in the middle of the night. This was before learning about ARC's, UK's, Inova's, etc. I was quite impressed by the brightness (of both red and white) and so I think it's a good light. But the coin cells cost more to replace than the light costs, and that's why I switched to an ARC AA (coolness factor notwithstanding!) I think your Dad would like it, but consider it a throwaway unless you can score batts on the cheap.
BTW, I had a white one activate accidentally in my travel bag and didn't discover it until about 24 hours later. Yep, still burning at least half as bright as one of the fresh batteried ones. Pretty amazing!