This comment is super old, but I really like this intervention, so I'm going to respond!

First, a caveat:  I've found the most success with this intervention for students who are accurate but need to work on picking up the pace.  It is not appropriate for every student who needs a fluency intervention.

That being said, I have seen students experience a lot of success with it!  I have seen success using this with running text for 2nd-5th, sight words with 1st grade, and even letter sounds for Kindergarten.  It seems so strange, but it really does build that automaticity!

Just my two cents!