Rapidex English Speaking Course reminds me of an quip by Firaq Gorakh Puri a known urdu poet and professor of english language- In India only 2 and half people know english. First is Dr. RadhaKrishnan, second is me and half means Jawahar Lal(Nehru) "
This course was once known more for Kapil Dev, who appeared in its advertisement.
But, one should not go by that marketing ploy!
It is not a good book, and one really doubts that those who swear by it have learnt anything.
It may familiarize one with intricacies of english language but it is not a right teaching tool!
English language as many experts in pedagogy explain is based on enhancement of word power(along with idioms, phrases and right expressions).
One would only recommend it to those with extra bucks(read rupees) or an obsession to buy it!
Without offending anyone; this book is an eye wash!