Brilliant book!
They updated it around 2006 I think- just to include more stuff on the digital side of DJing. I got my first copy in 2001 and must have read it through 4 or 5 times while I was learning. I fancied reading it again last year, as much out of nostalgia as anything else, but couldn't find it so I ordered another copy.
I then found my original copy a month later while I was moving house. The newer copy has a more silvery cover and has "now includes digital DJing" written at the bottom of the title. All the original stuff is still in there though.
As for the OP, use the money you were considering spending on the course to pick up a pair of decent monitors, a pair of decent headphones, and a copy of that book. You should have enough change left over to pick up a few more vinyl records- tunes that you love.
Then read through that book- not only is it an excellent resource it is also a very entertaining read- and I guarantee it will help you re-assess your practice methods and take you forward. And considering your opinions on the newer aspects of DJing, that book & approach- with it's focus on the traditional methods- couldn't be any better suited to you.
But as others have said, don't disregard info from people with more experience than yourself just because you don't agree with a certain aspect of how they work. I hold specific opinions on certain aspects of DJing (I am sure we all do) but I am well aware that I am still able to learn stuff from those who operate in a way different to my own- in many ways having been at it over ten years now I probably pick up more useful stuff from those whose style of DJing is different to my own, purely because it leads me to continually assess how I do things and try things I may not have otherwise considered. :)