I have never seen Berserk, I think the whole thing about it being an unfinished story and very unlikely to get a good ending has kept me from getting the chance to see it, but just as you write about this anime, I have read other times about this story that it has a lot of fans.
I will watch the anime and get into the manga, I'm sure I won't be disappointed.
Although its continuation is uncertain, and may not follow the creator's ideas. I highly recommend the first ones and especially the Golden Age, you can understand the plot well.