I bought Series Two before this one - why? Who knows! And, although this is a great insight into climbing Everest from the North Ridge, the only problem is that unlike Series Two it really doesn't exploit the use of the climbing characters - the clients, Himex and the Sherpas. It does touch upon them but Series Two is when you really get to know the climbers before the ascent. Series One simply skims the surface but, as the forerunner, the lessons learnt here were simply put right in the next Series.
Still good stuff and certainly worth buying. I would recommend watching this before Series Two but, if you can only buy one, buy Series Two in preference to this one.