They are hit and miss, if you install one, and it fires right off, transfers with no problem, you will probably never see it again, because it has good odds to be trouble free. If it takes more than one crank cycle at first start, it will probably give trouble from then on. Customer support is absolutely terrible, at least it was 10-15 years ago. We installed several hundred of them in less than two years. Terrible to work on too. Kohler is a decent generator, but I install Cummins Onan. They are quieter and never had a problem with them. The ones that had the non metallic enclosures were real quiet. The new ones with the metal enclosures are a lot louder, but not as much as the Generac. A lot bigger enclosure, but makes it easier to work on. But their wiring diagrams are crap, as they have several different models of transferswitchs. I guess you get what you pay for. If it’s not that critical that it works every time, then you can save some money, as they are cheaper to install. A lot of engineers will not spec them if it is a commercial customer that requests a reliable back up system. The thing with Kohler, is they want a dealer to do the startup, or they will not warrant them. At least that is what they used to do.