I bought the Sig cap231 a year ago. Had good times with it but it was NEVER my favorite airplane.
I had a Moki 1.80 and JR radio with a gryo on the rudder...which saved me a number of times.
It handles like a "Cap". It is short coupled and I didn't think it was as smooth of flyer as a Extra. I am a old pattern flyer so smoothness matters to me. Do not EVER let the CG get behind what the manual tells you. My first flight was wild with snaps at the bottom of some loops and a snap at the bottom of a split-S....way-far-out. A lot of people had problems with aileron flutter. Sig kit has wing servo's mounted on doors...which wasn't good. I put hard wood rails in wing and used 4-40 ball links and had no problems. Replace wing dowels as they are too soft. Broke "one" of mine doing loops with snap at top with hard maple dowels one size bigger. I am doing this with all my new kits as the dowels are made of mahogany now days. I have some OLD (40 yr's) hard maple dowels left over from my single channel days. Last night I took the "stuff" out of mine to put in P-51. Going on auction at local club.
My advice is, there are better flying planes out there...just my opinion though.
If your a "peddle-to-the-metal" flyer, I guess you will like it??