I had a JJ1800. It ran great for the first 4 hours. After that, it was a total nightmare. It kept destroying the turbine blades. I sent it to Gabe on at least 4 occassions and each time I'd get it back, it would destroy the blades on the first flight attempt once again resulting in dead stick landings. Eventually, I gave up on it and Gabe sent me a 1400 which is sitting in a jet hanging in a Hobby Shop. The 1800 was a very powerful engine. I still have the destroyed one in my shop.
Steve