I agree. I had both. If you are going to use a .91 then dont go with the Goldberg. It needs a larger engine. It flies good and builds easy but needs more than a .91. I had one with a Super Tiger .91 and it flew ok. Landed very slow and had no bad stall tendencies. I currently have the GP .60 and it flies MUCH better IMO. I have a Saito 1.20 and it has unlimited vertical, lands like a feather and looks alot nicer. It is very easy to build. Most important is to keep it light as possible. The GP Extra came in just under 8lbs.