Well, the only JetJoe engines I've seen running in Dubai were absolutely non-impressive. The last one flamed-out during a go-around and the model crashed nearby the runway.

When I compare that product with a same size M90 producing 100N of thrust at 28°c and peak EGT 550°c, acceleration in 3 seconds and rock solid combustion...

I've tested 4 M90 now and every new version coming is getting better from the original engine that I had and that was fantastic. I have no doubt that this engine is the best on the market at present time.
So I must put my hat down to Gaspar and let him know that every disappointed JetJoe owner is a potential new customer for him...