I've only just started reading Vikings, but am impressed by the author's thoroughness and familiarity with the norse setting. What I was looking for was a book of source materials so that I could flesh out my non-d20 norse setting, and I got exactly that and more from Vidar Solaas' well researched and historically-based book.
As well as several norse-specific character classes there are typical monsters, new spells, typical skills & feats, equipment and the lot - everything and more than I was looking for.
It's all got a wonderfully gritty and down-to-earth feel to it and I'm looking forward to getting through it and adapting it to my Dragon Warriors Legend setting. I chose this book over two others with similar content simply because it was the cheapest of the three. Without having seen the others, I suspect I made the right choice!
[5 of 5 Stars!]