-
I have had the Soma Porteur rack as well. Superb quality and finish. I wouldn't use it for touring as it's carrying abilities is much greater than the amount of shite you would/should carry with you on a touring trip. In other words, to me, the tubing is too heavy and to large diameter, to make sense as a touring rack. It will make a perfect everyday rack though.
If you are buying it to make a tourer, don't. If you are buying to make a functional bike you can tour on, do it. It will be fine with 26" I believe.
Thats what I was thinking! Looks like the platform is much more use than the one on the blackburn. Quite a bit more expensive though, and i'm not sure how nicely it'll play with the cantis and small wheels.
edit: only place ive seen it work is here but the frame is actually a 700c.. :(