When any pilot thinks their plane is getting boring, ask someone who's better than you at flying aerobatics to fly it. You'll feel sorry for the plane and probably humbled a bit. Kinda like when I think my golf game is getting better and I play with guys who are 10 times better than I, makes me realize that my game is no where it needs to be.

A buddy of mine who is an awesome pilot, better than I, let another pilot fly his Cermark Pitts. This guy pulled it into an inverted spin, something my buddy can't do and he was really impressed as he has been unable to complete that manuever.

I personally like the four star and it's probably way more capable than you might think. I haven't flown the Goldberg Tiger II and never have seen it fly, but I respect what RCKen thinks and if he recommends it, then I sure its a great plane.