In terms of the thermostat and flow switch both died in the first 20 hours. I had complained about the flow switch as it was limited to 8 gpm and of course I had a 12 gpm burner. I had a replacement mailed to me right away and replaced the broken one when it went down. In terms of the thermostat, replaced it with another GP one and haven't had a problem since.
Some how they also forgot to put in the bulbs in the diagnostic center and I have been waiting a few weeks for them to arrive.
Once the burner got up and going its been running strong. My biggest design issue with the 120v version is the fuel tank. No way of knowing the level and a small tank makes it need a filling way too quick.
I haven't run steam yet, but around 200`f with full flow I can drain the diesel tank in 3 hours. I am strapping an 80 gallon tank to the truck that I can draw from that and not have to use jerry cans to get through a day.
Just my experience so far with the espec burner.