Amy and Alberti work for me, as does Amy alone. Someone else noted the A&A team really seem to very good friends, and it makes the banter realistic. But when David and Amy had that holiday(ish) seasonal show last fall, I did not "feel it". Whatever that means, it sounds like that was the impression some people felt last evening.
If you recall way back, Shawn used to be with David as Saturday Morning Q, and I liked them together. She was less the current SK personality/storyteller and he was not so down home. For some reason they balanced each other nicely. I have no comment on the current SMQ team, except for Alberti needs a new partner.