Right Track Reading

I have a few students this year who don't seem to hang on to sight words. I was doing a lot of research about it and found this reading program. It is meant to be a one-on-one program for tutoring struggling readers. I am squeezing it in whenever I can with a few students and it seems to be working really well. I am wondering if anyone else has used this program, and if so, how did it go? 

Thanks!