I would most definitely do it again. The original unit cost me a thousand. I have put about 700 into the unit over the course of the last twelve years and it is still running strong. I have learned a bunch about the unit, of which the most important is to change the o-rings that go to the water pump every time you open the case. If not... IT WILL LEAK eventually. The o-rings get baked and hardened over time and never seal right again if disturbed. The biggest portion of the cost was changing the water pump last year. It was 300 on its own. The other screw job is paying customs on parts as most come from Canada.
Troubleshooting is real easy. It has trouble codes and the unit is straight-forward. It is easy to take apart and the design is top-notch.
If you get in a bind for parts, call Trailercraft in Anchorage and they can get you anything and fast. Royce at the Commercial St. store is good at dealing with Espar and getting parts.
I use mine twice a day for 5-6 days a week and use it from about 1 October through 15 April. They tend to run better if used more like any machinery. Running it periodically during the summer keeps it happier as well.