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Actually, all those are free. I checked (I have an account that for some reason hasn't been upgraded to premium). The advanced options to filter and compare cards, as well as setting the conservative or aggressive prices for rentals, are premium options. Maybe others too.

@gadrian is right. Everything that is mentioned in his post are all free. Basically all features available for free before the premium update, will remain free even the free premium subscription has ended.

If you'd like to take a look at the features included in premium subscription, we wrote an introduction post here: https://peakd.com/hive-167922/@gadrian/taking-a-look-at-some-options-in-peakmonsters