Reviews of Singing Success are mostly good.  There are far less negative reviews than positive ones.  It must be pointed out that many of the negative reviews are not really about the quality of the course but are about other problems encountered with shipping.  Even these problems were sorted out and the disgruntled customer continued with the course.  Reviews whether good or bad are what give you a clearer picture of the course you want to purchase and also the level of customer service.  An important aspect of customer service is how well a supplier can fix a problem.  In this regard, Singing Success has a very good rate of success.