I bought it in 2012. The boards in the generator and the ats have been replaced already.Just out of curiosity how old is your system? Reason I ask is that is one main reason I pushed my mom towards a Generac whole house system. Kohler's generators are pretty comparable to Generac (or they were then), but their ATS sucked. I read a ton of people posting horrible reviews about the ATS.
Mom's Generac smart switch has been rock solid so far and it's been awhile. Several years past warranty.