I've ran Etecs for the past seven years and they have been great for me. I swear, everybody I know running an Opti 250 has had to replace the air compressor at $1000 a pop. One guy is 3 for 3 at owning Opti's (2003, 2008 and 2014) that had it fail. A few had the power head shoot craps within 50 hours after that as well. They run well, but I'd be really nervous to run one once the warranty was expired. The 4 strokes seem to be a lot more reliable, but they are all 150hp and less.