I don't like not being able to specify the exact value of the ticket. I always buy tickets in multiples of the cost of a round trip commute, so that a) I'm on my home, not on my way to work, when I need to buy a new ticket, and thus not in a rush; b) my balance ends at zero, so that the exit turnstile eats the ticket, making me aware that it's out of money so that I'm not taken by surprise by an "insufficient value" message.
That only gets me one round trip, and I don't want to stop at the kiosk every day. It lets me buy multiple tickets, but not put multiple trips on one ticket.
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I don't like not being able to specify the exact value of the ticket. I always buy tickets in multiples of the cost of a round trip commute, so that a) I'm on my home, not on my way to work, when I need to buy a new ticket, and thus not in a rush; b) my balance ends at zero, so that the exit turnstile eats the ticket, making me aware that it's out of money so that I'm not taken by surprise by an "insufficient value" message.
This design has a "make round trip" button, which would fit your needs exactly.
That only gets me one round trip, and I don't want to stop at the kiosk every day. It lets me buy multiple tickets, but not put multiple trips on one ticket.