I have two bikes with them, one Croce d'aune and one with the last generation Record.
The last version has 5 pivots, bianchigirll is show an early version with 4. The last version is much better for stopping than the Croce. They are probably the best brakes that I have on my bikes.
The only disadvantage of these brakes is that they are heavy and a bit more difficult to adjust. They will need a 3,5 mm allen key, which apparently is difficult to get in the US (here in Holland they are easy to find).
Prices I don't know, the Croce d'aune's were a present from a friendly bikeshop.