I downloaded this recently and when I started to use it I had problems that clients/web developer contacts were opening it in other versions of Illustrator were getting flat rasterized design files instead of vector layered design files.
I tried to 'save as' Illustrator 8,9,or 10, but my web developer says they still can't open it even when I save as an older version.
This was several weeks ago, and my upgrade is now sitting there unused and I'm back onto Illustrator 10. This is pretty sad considering the cost of the upgrade, and I shouldn't really ignore this much longer!
Best Wishes
Amanda