RE: SIG Somethin' Extra
If you're confident with your flying skills, and can perfom a few 'tricks' the SE will be a welcome addition. But you'll need to keep it on low rates for a while, as It can get hairy. And you'll be introduced to the world or 'tail draggers' as they have their own unique take off traits.
Most people graduate to the Sig 4 star line, then the SE. the 4 Star is just a little less 'airobatic' / more tame. I love them both! And they both build in a few evenings! The radio gear and engine can be swapped form one the other as your skills advance..