I can't say with authority how similar these are to Insanity, since I've only done two Insanity workouts, but they're drill based like Insanity and most are intense. I don't have any dread factor with these, though, because they're only 20 minutes. And even if they were longer, I wouldn't mind, because I enjoy these types of workouts. In fact, I think I've never done just one of these and always tack on a second one even when I didn't start out planning to do that. Easy to do when they're so short.
I really like some of the moves, which are very familiar (no previewing needed), but at the same time often have an interesting twist. There are several moves, like squats, where you simply pull your arms back at the end of the move, which I find to be a simple change, yet a good postural move/reminder.
As for JNL Fusion, I'm not familiar with that, sorry, so I can't help...maybe somebody else has both?