It worked really well when I used it. It replaces a bunch of the stock navigation tools, and takes a bit of learning, but really seemed to be a good n-body simu

It worked really well when I used it. It replaces a bunch of the stock navigation tools, and takes a bit of learning, but really seemed to be a good n-body simulation engine. It's been well over a year since I touched KSP though, so I can't speak for the current versions of either Principia or the base game.