I have a Swamp Creeper 3000 and it is pretty amazing. It's also really expensive, too. However, where we wanted to use it precluded the use of a DIY chiller, as space was limited. They bill it as a continuous fog machine; I had my doubts, but it does run continuously, which is really cool. The wired remote control gives you the ability to control how much fog comes out, which is needed, otherwise it would be too much fog. You can also set it to timed fog, so it goes off at regular intervals.
We have it in our courtyard, just to the side fo the front door, and it spills out ground fog nicely - so long as the weather cooperates. When the wind is calm and the evening/night isn't too hot, the fog is spectacular. Rolls along the ground, out the courtyard and down through the front lawn, where the cemetery is.
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I did have an issue with the pump the second year, but halloweenfxprops sent me a new one and it's been working great. I think the issue is that the cleaning fluid is too acidic or base and gums everything up or dries it out, I'm not sure which. This last time, I left the fog fluid in from the last use. Checked it a month ago and it worked great.