I am on my second GB Extra in the last 12 years or so, and I have the GP Extra. Kit quality, the GP is probably a little better. In the air, the Goldberg is way ahead of it, but it would be marginal with a 90 in it. We fly them with Webra 120 two cycles or TT 120 two cycles, with sparkling performance. I have a Magnum 90 two cycle in the GP Extra, and it is a good power combination with that plane. If you want to do IMAC, go with the Goldberg but try to finesse your way into a larger engine!

Clair