I assembled a Goldberg Ultimate ARF this past spring and I have flown it all summer. I purchased a Great planes Skybolt Arf a few weeks ago and am presently assembling it now. I was not impressed with the Ultimate as far as quality of the kit. The fit and finish was not as good as most of the Arfs I have assembled in the last 4 years (30 + Arfs built). The kit design just seemed old and outdated. As far as the flight goes, I'm flying mine with a Saito 1.25 and it flies excellent. I really enjoy flying the Ultimate. The Skybolt is a modern design, laser cut parts and the fit and finish are excellent. The plane is building light and I'm powering mine with a OS 91 pumped FS. Since i have not flown the Skybolt as yet I can't tell you which one has better flying capabilities but the Skybolt is a beautiful plane and build.