used them many time here in South Louisiana they work realy well , I use a roll of toilet paper with the center cardboard removed, shove it a coffee can and pour in a bottle of rubbing alchohol. Put the lid on and let it soak awhile. When you light it only the fumes burn, when you see the paper wanting to start burning cover with the lid, the fire smothers imediatly. The only danger I found is that the fire burns very clear, be careful not to burn yourself, other than that it seems to be very safe. It's cheep, can't spill, and has hardly any smell when burning. If compared, its alot safer than a high pressure propane bottle between your legs. Just my 2 cents.