I bought this in 2012 and used it a few times. It requires a 40 Amp breaker and worked well but I couldn't permantly install it because my electrical panel is only rated for 50 amps and I already had a 30 Amp dryer load on that panel. I am now using a Clipper Creek 20 Amp model.
Here is a link to the CL ad:
http://losangeles.craigslist.org/wst/pts/3950690023.html