Yes, I saw and read that topic. I also described something SRPish using ratings as the storage of the review history here last year. But then I felt that the 6 levels of rating where too confining. So I write the review history away in a custom metadata field with unlimited space, and use the rating only as a tool for making a review. It might be interesting to some day look at the review history, e.g. by exporting the card name and the history meta-data field for analysis in Excel. E.g. to find out whether the whole SRP thing actually works for me.