The ‘Current Issue’ plan gets you access to the current memo, one at a time, which is updated every two weeks. Older issues are not accessible. (First 3 memos are complimentary!)
The ‘All Access’ plan gets you all memos in archives including the current memo. Archived memos also come with perks like machine readable references (all links and references can be saved in one click).
Both plans are valid for the duration of the subscription purchased, after which they can be renewed.