I fly 3 Simjet engines. I have never had any other kind. My 2300 is an older engine with the D2 ECU. Puts out 24 1/2 lbs.

I also have the Simjet 700 in my Savex L39 putting out almost 8 lbs.

All of my engines have been great!

If your looking for a second brand of engine to consider, I would look at the Simjet line. They now have a full service facility in the USA.