Hi Ckaussepue63
The saver day Pass is in fact a pass that allows you to travel without hesitation and being afraid of having the right ticket.
I guess that your question comes up, because you can buy it having already a Half Fare travelcard ( then it costs less) or without a Half Fare travelcard (it costs more). in your case without.
Yes it’s worth it if you will travel quite a lot that day. It depends on where you want to go, therefore if the tickets purchased seperatelly are less expensive of the Saver Day Pass itselfs. Please note the refounds conditions…
https://sbb-tickets.cc/en/tickets-offers/tickets/day-passes/saver-day-pass.html

For which day ?
Thanks
Romano