well I dont like em

I think I already voiced my opinion on this topic somewhere else
Too much heat. I think tanks®ulators are better. But hey. If you got cold growroom temps or an ac to cope with the heat go for it. Filling up a propane tank is cheaper than filling up a co2 tank. Plus you can get it anywhere, and its not as "wierd" as filling up a co2 canister.
THen again the reality of having a propane tank inside your house isnt very fun... It really should be located outdoors. & piped into the room
a DIY co2 burner seems very dangerous to me.

I'm scared of my greenair cd-6.
-burner