Altoholic only gets data from the other accounts when you manually choose to transfer the data, and they both have to be logged in simultaneously.

If this addon is able to keep the cross-account data up to date on the fly automatically it might be able to compete with my current method of just opening everyone's bags simultaneously and just looking around.the screens manually.
Though, it sounds like a all-in-one-bag solution which I have never been a fan of even for single characters in the first place, so we'll see I guess.