Here’s a few real live testimonials taken from  Amazon and Ebay:

Amazon.de 5 star *****  Great, inexpensive entry for pop and jazz lovers

A wonderful introduction to the teaching of harmonics, especially for those who - perhaps as I am from other instruments - want to approach the handling and playing techniques of keyboard instruments somewhat more systematically. Thanks to the integration of pentatonic and bluescales, it quickly provides access to amazingly easily developed modern sound worlds for pop and jazz lovers. Thank you.


Amazon.co.uk 4 star ****  Four Stars

Just what it said on the cover.


Amazon.in  5 star *****  Super

Great for learning.