We did Cabanas once for dinner, only because our PA returned late and we missed our MDR first seating and didn’t want to wait for second seating.
The waitstaff in Cabanas seemed like they were very much the “B-team,” compared to what you get in the MDR. They were very nice and were trying very hard, so you were really rooting for them, but there were a noticeable number of kinks they needed to work out before they’d be ready for the Big Show.