They're lovely engines. I've got the 60X and I picked up an 80X for my son. They're very powerful but easy to handle, run perfectly on zero nitro if you want (and we do ). Strangely, the latest manual that came with my new Enya 60 listed the 80X as a current engine but it doesn't appear on their web site. My only complaint with them is that the back end of the muffler has a tendency to unscrew.