Jan 28, 2011 - I bought this last July and it's been a great investment. I use it 2-3 times a week for my hot oil, pre-poo and DC treatments and I notice a definite difference between using this with my treatments and not using it. Plus it's great that you're not confined to one place with this. The instructions say that the heat only lasts for 20-30 minutes, but I've left this on for an hour without reheating it and it still felt somewhat warm -- not piping hot, just warm enough to keep your head toasty. When I have worn it for over an hour, I've just reheated it and put it back on my head with no problems. It's really a fantastic little invention!