I volunteer in a school that uses RWI (3rd year they have been using it, previously using JP) and they report a massive difference in results.
Ooh yes on the marshmallow clap thing! But all the kids seem to love Fred (bless him).
Agree that it is a bit dull but my DD (not at the school I volunteer in) would have preferred it as she found the songs/rhymes with JP an unnecessary thing to learn, she just wanted to know the sounds.