Not first hand........But one of the local guys converted his Q-2 from
the VW to the Jabiru 3300 and just loves it. Had a problem with one of
the exhaust valves at around 50 hours - IIRC - fixed under warranty and
reported to be nearing 500 hours.

I think they look a bit fragile, but "cute". His results seem to be
proving my impression wrong.

His reported performance numbers are better than some O-200 powered
versions.
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Leon McAtee