you've got to keep the ratios right. not that big of a deal though, really cool if you already have a compressor and pressure washer. unfortunately i have neither of the above, and it's not worth buying those to me.
I have been making snow at my house for a couple of years now. I have used a Backyard Blizzard now for the past 2 years, the thing fucking PUMPS out snow. I have it for sale on CL if anybody is interested.