I hear you, brother; j'entend ton coeur. I experienced the same with a Zappa release (the younger kids have driven that name into disgusting territory, but I digress) that was teased via a trailer on the 'Baby Snakes' DVD. The wait proved to be greater than a decade, and I was seriously wondering if I would live to see it. Almost exactly two years ago, I finally had a copy of 'Roxy' - on bluray. It was well worth the wait. I hope you feel the same way about this book!
I had heard Tangerine Dream before, but 'Force Majeure' was the first TD album that I purchased. I lived in Germany when it was current. I rather enjoyed it. I should give it a spin. On the same trip to the record store, I also picked up something a bit older, but in a similar vein: Klaus Schulze - 'Timewind'.