I get all the information I need to judge conditions and locations.
If you only need things like predicted wave heights, winds, tide and swell intensity...there is no real need to spend any human $$$.
I admit, I have in the past paid for monthly memberships which gave me access to a lot of live surf cams and deeper access to the forecasts and other functions.
So, if you chose to spend human money for in-app purchases, this app is worth it.
Jahbaker about Surfline: Wave & Surf Reports, v4.3.4