Note my avatar....since I haven't flown the GP Wagstaff yet (it's still new), the GP Pitts is my fav.
Many have said it - the ADVANTAGE of the Pitts is the short fuse instability. You can corkscrew around, spin, tumble, snap, and do rotational maneuvers in all three axes. If you have lots of power, you can also do all that stuff on ANY line you like, 45 up, 90 up, your call.
Outside vertical snaps on an upline, followed by a flat pinwheel inverted at the top, then into inverted spins.
Like someone else wrote (right, AJF-2 ?

) REMEMBER to breathe!!!