This arrived today. I only bought it for a bit of fun. A can / drink chiller.
I tested it with a warm can of tonic water (35℃ / 95℉ ambient temperature in kitchen). Took a lot longer to chill to a decent temperature than it would by my usual method - chucking the can in a freezer for 15-20 minutes.
However, I can see it being useful to keep already cooled cans or other drinks in that cool state as I work at my desk, sipping away. It might also be useful for people in offices with no other cooling devices, but I work from home (a little) and have two freezers.
I need my cold beer.