Hey, anybody have any comments about the Gulfstream 150? Perhaps any experiences with getting typed in it?

The reasons I ask, is I am a flight instructor in the Midwest and one of my student's families owns a company that utilizes a G150 for their transport. He has mentioned several times that he'd be interested in getting me into a backup pilot slot. However, I am not sure what the insurance companies would have to say about this. Currently I am sitting at 1300 hours, roughly 100 hours multi.

Any help would be appreciated !