The only thing is you can receive your tickets from any of the yellow ticket machines rather than the one you have location for. We stayed in Marghera, and there were machines at the main station Mestre. As we were not staying in Venice itself. Great it inc the buses as well.

Highly recommended if you like to explore. This is a great, cheap way to get around Venice and it’s surroundings, and particularly to see its islands. Although the buses are cheap, the water buses are comparatively expensive, so, if we hadn’t bought the passes and paid instead for individual tickets, we estimated that we would have ended up paying over double the cost of the passes. A word of warning, the buses and water buses can be crowded and you can’t always get a seat, but they are frequent and, usually, on time (certainly better than in England!).

The pass is a good idea but don't do what I did which is to not read the small print. I did not read about validation and where we got on at the station everything was open. You didn't have to click your ticket anywhere - result: ticket inspectors and a €50 fine each for two of us. €40 plus €100 fine for two of us, hence one star for value for money!