Kostas, yes I do. They run well inverted, I've found that they are easy to tune and they have no valves to adjust (unlike most/all other 4-strokes). They are perhaps a little heavier than other 4-strokes but I've not found this a problem (and can be useful on short-nosed warbirds!)

Use the right fuel and plug and run them in as recommended and I'm sure you'll be happy. They improve in power over the first few hours of running and I've noticed a few hundred to 1000 RPM improvement is not unusual as it beds in. By the way, they test run all their engines before shipping them so when it arrives you know it has been run successfully and it is also close to properly adjusted!

What plane are you planning to fit it to?

Richard