Well, there's one at Barton. I used to part-own a Yak52, which has the same 360HP engine. So it is thirsty (at least 12 gallons/hour, but over 20 at aeros settings).
I've never flown an 18T, but they are aerobatic and look fun.
Like the '52, maintenance will not be a problem, but the radial engine requires suitable care (e.g. pulling through etc).
SSD