Oops - missed this thread earlier ...
Patricia and I were discussing these papers recently, as I had given one of the "green book" tests to DS2.
I felt that the layout is probably a little large compared to the NFER format, so they are probably best used before September. The standard seems OK - some challenging vocab.
I would tend to use them like the Walsh papers - useful added extras if your DC is going to need more practice materials than those on Patricia's list. As I said though, probably in August, rather than September.
I think that Patricia agreed with me - we wandered off on to another topic part way through the discussion, but undoubtedly she will be along shortly to verify that (or otherwise!)