These are fun/easy to make, and I have used mine again and again.
I prefer these little stoves to my hummingbird or jetboil stoves. They're incredibly lightweight and all you need is a few ounces of alcohol (everclear, rubbing alcohol, heat, etc.) to get you through most backpacking trips.
This guy uses beer cans, but, I use the extra large energy drink cans (I don't actually drink the stuff) so I get a lot more burn time with mine than these guys do.