I put this adventure in my campaign and the players loved it. I suggest DMs have one of the first angels tell the party the bell is headed to the material plane since that gives the players the most interest in stopping them (rather than just accepting their demands to leave).I think the encounters lean too easy in general and suggest DMs balance for their party. All that said, I'd definitely run this again for another group.

Fun in the astral plane...what could be better?

Dan produces great material, and this module is no exception. Plane hopping, demon vs. angel good times!