Thought I'd add my 2c worth here since I have a TBM 260 that was built last fall and finished by Tony Russo. First, it is a wonderful flying model No doubt.

Someone mentioned the weight of mine. Correct. It weight 38lbs 4 oz. I added less than 10oz of structure to it, which was in the form of a pipe tunnel and some maple square stock behind the f'wall. As for the really light ones I hear about

My wing panels (balsa ribs) weigh 3 lbs 7 oz and 3 lbs 11 oz.
For reference, the foam wing panels of my Carden Extra 330S from the last TOC (bulit by Brian Hueffmeier) weighes 3 lbs 4 oz each.
IMO foam can be built lighter.

A wood wing built incorrectly can also be a real problem. Personally, I'll take a good set of foam, wings for my 260 right now.