Got the new WhippetX and gotta say I love it. It feels like a longer Zone OS. It is a meat hook. Beefy as heck. Prefect for forehand shots, FH flex shots, spike hyzers, hook around corners. IMO you need a silly OS disc somewhere in the bag, and if you aren't bagging a Tilt or Zone OS, this will have your back. 

The Whippet is a funky disc that is unlike anything else out there.  The shape is a little like a flying saucer from a 50s science fiction classic.  It isn't uncomfortable in the hand, it just doesn't feel like anything else.  The flight is super overstable, which could make this disc a great option for your utility slot and does a pretty good job in that role.  The best thing about the Whippet is its ability to hit the ground and skip (seemingly) around corners.  The skip shot is by far my favorite use for this disc.  It rarely makes it into my bag, but I am glad I have one on hand.  If you get a chance to grab one, do it without hesitation.  These are kinda hard to find.