I should have prefaced by saying my sinuses are extremely reactive to wood dust, especially poplar plys in plywood I use. That's a big reason why the domino and all the festool systems appeal to me. I have an early model freud biscuit joiner that has no outlet for dust collection and when I cut slots in 3/4 birch plywood for carcases (and I cut a lot of them) , I create a real snowstorm in my shop. That said, the only reason to keep joiner that I've read so far would be for door casings. Good point Dixon.
Matt, when you say you use biscuits for table top fasteners, do you mean cutting slots for the metal (or wood) clips to attach the table top to aprons? I would think the Domino would work better in that capacity.
I have too many tools in my shop that I have in the "I might need that someday" classification. I've been selling a lot of them in the last month and already had enough scratch to buy a domino. I don't have to tell you how expensive this festool habit is.
I know my joiner isn't worth that much but I have a friend just getting into this hobby and has expressed interest in it. Every little bit helps!
PS MerkleBob, I was under the impression biscuits swell more than dominos as they are made from compressed wood chips where dominos are machined from solid wood. Correct me if I'm wrong.