It also barely covers the story. Berserk, while a great anime, and a great manga, is famous for leaving off at what amounts to a cliffhanger. The events as described in the anime are really the prelude to the whole story (Okay, in the manga it takes about 10-12 volumes to arrive at this stage too).
Its afterwards that you realise that you have just seen a 25 episode chunk of back-story.
It is good though. But if you are expecting to get into it further, you have a lot of manga ahead of you (last volume in japan was 30 or 31, Dark Horse are only up to about 12/13.