As the author of the Joes 2 Pros series I certainly appreciate any comments from readers or potential readers. It's the enthusiasm of these readers that has catapulted my books into the top tier recently. We consistently challenge the more established brands like Microsoft Press to be among the top selling SQL books on Amazon. I encourage people who have read my book(s) to continue to leave authentic comments and feedback. As a self-publisher who uses create space I absolutely rely upon the feedback and word of mouth to compete with the big publishing companies. I also rely quite a bit upon social networking and speaking engagements to get the word out. This may explain how someone using Twitter may know my whereabouts.
Having said all that it is important to point out that these books would not be selling the way they are around the world and being adopted as course material for major Universities if the content was not outstanding. I post the first 80-120 pages of every book for free PDF download on my Joes 2 Pros website so people can read before they buy. I hope that Karl will read one of my books and leave me some candid feedback on the content. Thanks.