I bought this with the nitro kit last time around, and the nitro has never really worked right. First, they don't have any instructions for it, so I had to guess. There is a condensed video with no audio on their website of a guy putting it together, and the first time I tried to do that, I got no "nitro effect". It also seems to have a sprung a leak somewhere, there's some sort of exhaust valve which the gas escapes from as soon as I plug it in. I have to hold the valve just right to get it to work, and I've had to use 4 or 5 canisters each time I've used it. It was annoying enough that I haven't bothered buying more once I ran out.