The higher tiers. Not sure about the top one (Premium) any more. I got it because I thought I might want to play the older games, but it turns out there’s plenty of PS4 and PS5 games to keep me going, and frankly not enough choice of PS1 and 2 games to tempt me. A more complete library would have made sense, but I’ve literally got more on my shelf than they’ve got on PS Plus Premium.
And my internet is too rubbish for me to want to stream the handful of PS3 games either. It hasn’t even got MGS4 which would be the one interesting thing that hasn’t been anywhere else.