DS's school used Read Write Inc books in Reception and Y1, but once he got into Y2 (and now in Y3) they don't use them at all. The children pick a book from the class library, and fill in their reading journal to show they are reading. DS is a lazy and reluctant reader, although perfectly able, so he picks easy books.
I asked about it last year and his teacher said that since he can read now, there is no need for the banded books.
I see on here that many (most?) schools work their way through the full range of colour bands. Is it unusual to quit them early?