RE: Sig Somethin Extra?
I have an SE and it's my favorite throw it in the truck and go fly plane. I have a 46FX on it and verticle is unlimited with an 11x4 APC prop. This plane is not a 3d monster, but it wasn't designed to be. You'll have a harder time hovering with this plane than a UCANDO, and the rudder leaves a little to be desired. That being said, the plane is a blast. If you can hover this plane, you'll have an easy time hovering any of the 3d planes out there. The cg can be moved WAY back from the recomendations, and it just makes the plane more fun to fly.
Here are a few things I did with mine. Hope this helps...
-Ditch the plastic pushrods and replace them with metal (or carbon fiber).
-Get the cg to a point where you're comfortabe and then put a mac's one piece muffler and a slightly heavier tail wheel on.
-Use a Nihm (or LIPO) to save an ouce or two near the cg.
This plane flies best when it's as light as possible. There aren't many places here that you can save weight (other than c/f landing gear and lighter servos) so make sure that you don't add extra weight with extra stuff.