Stwils do you have a link to the course? Not clear from the post which one you're talking about.
Chess Visualization Course

I was going to buy it, but it was out of stock at the time, so I didn't.
There was a really good review of it on the internet somewhere, which along with Hesiman's recommendation is the reason I had decided to get the book. Just googled and found it: http://www.chessville.com/reviews/chessvisualizationbook1tactics.htm
It's a great book and the price is reduced if you download it.
Can't go wrong with it -- However: all these books take work and dedication.
Nothing will take the place of that.
The approach is unique, there are no other books like it.
And the author is selling direct, so your purchase will help him to produce more volumes. A great thing for our chess community!!!
Go for it!
Does anyone have any experience with vol 1 of this course? Is it tedious? I see that Dan Heisman recommends it for tactics training. Advise, please. Stwils.