Follow up:
I went ahead and bought one, and haven't really had a chance to test it much.
However, my two little mosquito-magnets wanted to paint pumpkins last.
I set 'em up on the patio, with the ThermaCell going, after dark, with the porch light on, no other repellant, and I didn't see a single flying insect. That's very, very unusual at my house.
This evening I'll inspect the magnets for new bites, but I didn't see any this AM when getting them dressed.
I'm not ready to tout it as the best thing since sliced bread, but I am cautiously optimistic at this point.
And, yes, I did use my 2- and a 4-year-old daughters as lab rats.