I'm not sure about the TH55. My concerns about it are a) some of the buttons, including the jog dial, are on the back, and b) the processor seems too slow (or is it?).
Today I'll try to play with both, the T|T3 and the TH55.
And I'll post a new thread asking for references about the TH55.
You see? I'm trying to make a responsible decision here!