Very pleased with the Airmaster. Went on a round NZ air race soon after it was fitted last year and then have done about another 30 hours shorter trips over the last few months. All good and no issues. Performance is about 3 - 5 knots better than what I had before at the same cruise power setting.
Overall appears to be a very fine piece of kit and I am very happy with it. I have recommended it to several other pilots considering changes so not sure whether you have had any inquiry as a result. Very happy to act as a referee if you ever need.