Any chance that you might produce an adapter kit that would allow the use of old-style snappy Brain Cells with the new-style clippy bags? Or, for that matter, new-style clippy Brain Bags with old-style snappy bags?
Old-BC-to-new-bag seems like a pretty simple thing to make -- just a loop of nylon strap with a snap to attach it to the Brain Cell. To go the other way, you'd have to have a clip on a snap, or maybe a snappable or velcro loop that could provide a snap on a new Brain Cell.
Either form would make transitioning to a new bag much easier (and having both would make it easy to swap both newer and older Brain Cells with new and old bags).
(I'm itching to get a Super Ego, but have an old 12" Brain Cell in my ID. I'm about due for a new laptop (which will require a new Brain Cell), but in the meantime I would still want to be able to use my old Brain Cell.)