The SSE is an easy to fly plane, it really is easy to build too, but, it has alot of control surface behind it too. They bolth fly very well, but the extra from GP is a little more refined and smother like a pattern plane, where the SSE is more of an extreme fun flyer type plane. Basically a copy of my HERR lil' extra or the other way around if you want to get technical about timelines. I flew my lil' extra today and I must admit, it's stupid simple to fly, but with the expo turned down a whole lot. On normal rates, it's a handfull. Plus, when you speed up a design like that, it becomes touchy on the sticks. The GP extra is tame throughout the whole speed envelope and does only what you tell it to do. Fly the GP extra, you won't be disappointed.