Hi VA
If you like tinkering with things a JJ is a good thing.
If you want to set a turbine up and fly with the lease amount of tinkering go to a Wren, PST, Jetcat or one of the more expensive units.
I have 2 x JJ1800 in a 3.5m Warthog yet to fly but will do this spring here down under 2 x Wren 200xls in my two FA 18f and a TJT 3000 in a boomerang xl. that is flown most weekends and has had around 100l of fuel put through it.
It took a little work to get the JJ's working well. The most important thing to do is have the wheel balanced.
What ever you choose have fun

swampy57