There was a thread discussing the new steel Allez (I assume you're referring to this one?). The consensus was a TIGed release was a poor reissue of their classic and not worth the asking price.
I have not read the thread; a link would be great.
Anyway, it's an R300, and when you put it next to my friends R500, frames are the same exact thing (mine is smaller).
Any difference in how they were made/materials?