I have one.
If you use isopropyl alcohol, a wick is a good idea as it's more difficult to get the stove started. Ethanol is easy though. It works great without wind. I haven't had wind blow my stove out. Keep in mind that it's a narrow stove, so it's especially important to find a flat firm spot to set it up. In rough testing, I found that 70% isopropyl was nearly twice as efficient as ethanol, and a little more efficient that 99% isopropyl. I think that's because it burns more slowly. It actually gets flames under my small pot. I had time to boil a second pot. Ethanol burns hard, and the flames go out much further. If there's any ethanol left when I attempt to boil a second pot, it quickly burned off when I removed the pot to refill it. Isopropanol does create a lot of soot with this stove though.