The pic in the OP shows the 1.0 in all its glory, welded frame, relatively upright (and fixed) seat angle, straight boom, and all. Somewhere there is a post that details all the differences, or you can visually compare to the newest versions on the website.
Mine has the 100mm chain stay extension - see my avatar - and it works fine. I'm not tall, but the bars would be much too high for me without it. If you go the extension route, there is a good chance you will need to move the derailleur to a different one of the four available mounting positions. (I did.)
Depending on condition, this is a great price on a great bike. I can't believe it's still here.
-Dan