These passes look like very good value. In a related question - I have a half fare card, I was just checking the SBB website and it says that 1 day travelpasses can be given as gifts:

http://mct.sbb.ch/mct/en/reisemarkt/...ageskarten.htm

Does this mean that when people like parents come to visit I can buy myself a half fare ticket (as normal) and buy one of these one day passes for each of them?

Potentially this would save a lot of money as Zurich - Luzern for example is pretty much the same price (if not more) as a day card.