Yes, I tested Rescue a few times successfully on the gasser, but I have not pushed the heli much yet since I am just breaking in the engine. Hopefully, I will push it a little more over the next few weeks. I have used Spirit Rescue may times on my electric helis and it has always worked perfectly.
No, I did not try the internal governor because I have only seen questionable reports on gassers.
I can live with both the Spirit and the external governor, because, other than the governor, the Spirit FBL controller has proven to me to be excellent, and my good experience with its Rescue feature is the main reason I have stuck with the R/C heli hobby. Following is a post showing my clean install of both the Spirit Pro and the GY701 governor.
http://www.helifreak.com/showpost.php?p ... tcount=134