Fucking awesome. Any vids of the Ushiro Goshi? That **** is Greek to me because i don't speak Japanese apart from the usual: Shinde Kurasai! Watashi wa ooki des! Bankai! Katon, Gokakyu no Jutsu! And other assorted phrases I'm sure you'll be familiar with.
Safety wise, I think you'll be fine. Getting the head spike is a fine and delicate art which requires great mobility through your back (see above), and you'll naturally tend to twist off to one side or another, causing your opponent to land on his shoulders-ish.
For follow ups, I usually end up with the guy turtled, and start working on taking his back.
Also, don't underestimate the suplex's twin brother, ushiro goshi. I tend to get bigger slams with my ushiro goshi than with my ura nage.