I have purchased all of them, and while they are expensive, there are definitely among the best styles I've ever heard. Not only is there a great diversity between the A,B,C and D settings, they are have fantastic mixes of instruments that really add variety to any performance. While I'm not positive, I believe they are orriginal styles--not tyros styles that have been reworked. You can also find lots of great styles that have been expertly reworked and tuned by Joe Waters at
http://psrtutorial.com/ and they are free.
Cheers,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)