I watched the first episode and it seems to have a good cast but I wasn't gripped. Not sure of what channel but it came up on my Sky suggestions so I downloaded it.
I've been watching it on BBC 2, it's terrible but I can't stop watching it for some strange reason. It's painfully slow, so I do other things whilst half watching, I don't think I could watch it all in one go.
I've watched about four episodes. Interesting that it's based on a real expedition - with a lot of conjecture thrown in. After watching the first episode I investigated the story. I'll say no more.
I'm currently watching the second season and it is as good as the first one. Though I read the book first. Maybe that's why I enjoy the series so much.