Bit of a let down imo. I found it to be on par with propane in my GHK M4. Propane wins as its cheaper. If you need some hot rocket fuel, I recommend Guarder Black or C02.
Some things on they're site is a bit pricy, however my experience with them was top notch. They even sent me a picture of the parcel before it was shipped out to me, which I didn't ask for but I was very impressed with the fact they did. Good service