It's very convenient to purchase through Klook. Each person receives a ticket with their own name and a QR code, so there's no need to print it out. Whenever a staff member checks tickets, just show the QR code for them to scan. With a Swiss Travel Pass, even if you take the wrong train, you don't have to worry about paying extra fare. It's recommended that traveling companions also take a screenshot, just in case there's an issue with the phone, so there's a spare. Sometimes you need to pay attention to the seats, which will indicate which station to which station they are reserved for; if you see that, do not sit there. This time I used the pass to take free cable cars, boats, and so on. Although the pass is expensive, it is totally worth it.