I would recommend flying one before you make any purchasing decisions. I wanted to like the TB20, I really did... I had found an absolute bargain. I love the cabin (which seems to be a marmite issue for a lot of people) but unfortunately I absolutely hated the control harmony.
I would describe the elevator as "normal" but the ailerons feel like they are set in concrete, which I put down to the relatively small size of the ailerons and the fact that the control wheel only turns a maximum of 45 degrees. I found it very strange and it really put me off the aircraft. Whilst I enjoy touring, I also like to pole the thing around the sky on a nice day - I didn't feel the TB20 was really suited to that.