I build the Frid style bench from a FWW book on the Small Shop back in
about 1990, the tail vise is a familiar friend on a somewhat undersize
bench compared to what many are currently building.  I don't find it
limiting, if anything, the tail and shoulder vise team up for 7 different
combinations of ways to hold wood.  I'm pleased to say my tail vise has
only the slightest perceptible sag after a quarter century which is a lot
better than I'm doing.  :)

David in Sunbury, Ohio