My thoughts on this afghan... It was the single best project I've ever done. First, just for the accomplishment of it. And secondly, because of what it taught me. I'm a pro at cables now. This afghan has more cables than a suspension bridge! And not just your average 3/3 cables. I knit 1/1 cables, 6/6 cables, cables that included seed stitch, reversable cables, and cables using 3 cable needles. But beyond the cables, it taught me many other techniques, some of them are very impressive, and you can't appreciate them until you've done them. Also, it really helped me refine my seaming skills.
It's a long project, yes, but the benefits are amazing. I think it would be a GREAT project for a group. But finding enough knitters who are prepared to devote 6 months to a year to this one project, might be hard to find.
However, if you just want to get in on a group and knit it, check out the Great American Aran Afghan Along
(GAAAA!). They're great people over there!