I sat in an FAA/Rotax presentation at Oshkosh in the US about four years back and was very surprised to hear from the FAA men some of the industry statistics at the bottom end of the US aviation spectrum.
I was shocked to hear that there are more hours flown every year in the USA behind a Rotax engine than both Continental and Lycoming added together.
That is a pretty powerful statement and statistic about how many people have transitioned into the lower end of aviation markets.
One of the other great statistics that I remember taking in from this presentation was that the failure rate with Rotax engines was less than Continental and Lycoming.