Well Ive managed to watch the first half of the episode and as someone who's read the book the show takes the world **** created and the story of the book in an interesting direction.
I'm not really surprised that they amped up the drama, though tbh I'm a bit disappointed, the way the book builds tension is really great and that seems to have been mostly ignored for the show, which is a shame, but I guess understandable.
Also the changing of the media that Grasshopper comes in is a massive deal, changing it from a book to some sort of alternative reality movie is a lot more explicit and in your face than it being a book, which could be used in some cool ways to flesh out a TV series.
The only negative I really have about the show is the style of the world. For me The Man in the High Castle was set in the 60's, but the TV show seems to have made it more like Blade Runner, without the flying cars, which is a real shame I feel because the whole setting of the cool 60's mixed with Nazism was a really cool visual in the book that would (I feel) have made the impact of America being controlled by the Nazi's much greater, as atm it just seems like another dystopian Sci-Fi show, with Nazi's being used due to a lack of imagination to create a similar 'bad guy'.