What does "landed several times with no damages" mean? Is landing an airplane second nature yet, or do you find yourself breaking props and bending gear on a fairly regular basis? You models look very nice and well taken care of, so I'm guessing landing is second nature.

If you're doing inverted figure eights with an Extra I would say you could handle the Sundowner 50. Just take it easy in the beginning. Remember, the Sundowner is not an aerobat - it is built for speed. Not that it won't slow down, but it just don't expect to be doing figure M's with 1/4 rolls.

Have fun!