As a fan of Kalmah's entire catalog, it's hard for me to say this, but these are the best two albums they've ever created. The interesting thing is that the production quality is not as good as their later albums, the technical skills of the musicians have improved on their newer albums, and I still prefer these over The Black Waltz, etc.
The reason for this is the same reason that Kalmah is the best at their particular brand of metal. They have an atmosphere on these two albums that simply doesn't exist elsewhere in the world of metal. I also like the vocals more on these two albums, although the actual lyrics are indiscernible.
In any case, the song Hades and its guitar solo are more than enough reason to spend the money for this double album collection. It is my second favorite guitar solo in metal (In Flames - December Flower is first), and has a feel to it that is unmatched.
As an aside, these two albums are what I always listen to when I mow my yard. Always. The fact that they make such a boring task go by so quickly is one of the highest praises I can give them. Every song is unique and a must-have for any fan of the genre.