We used them in Feb/03 and had 2 great tours in BA. City tour was a 1/2 day - good overview of the interesting parts of BA. Be sure and spend some extra time in La Boca and the Recolletta cemetary. The Tango tour was spectacular. They took us to "Ventana". The meal was okay and the show was wonderful. We going back (not on cruise) in Nov. and plan on seeing the sames show.
We didn't use thme anywhere else, but comments from other people on the ship were all favourable. We would use them again.
Have fun in BA - be sure and allow extra days if possible.