Just did FDP at Momma Melrose's. They seem to do a modified version of the HBD's arrangement. We were not allowed to order an appetiser and were limited to the Chef's salad of field greens with a balsamic vinegarette. We were limited to a flat bread of our choice, non-alchoholic beverage, and an entree of our choice plus we were limited to only tarimasu for desert. So really we were given three choices, that of flat bread, beverage, and entree. The other choices were made for us.
It was worth it to not stand in line and spend an hour-and-a-half sitting on those aluminum benches, but not what I would consider a good deal or real choice.