There are hundreds of in-depth reviews here, so I'll be short.

Yeah, it's really good. The artwork evolves from good to masterpiece. You'll be stopping a lot to look closer at some finer details on the panels. Berserk is worth reading just for that alone.

The story is also fantastic: dark, intriguing, and filled with characters you'll care about.
The tone of it shifts somewhere in the middle though: going from the absolutely brutal tragedy to somewhat of a classical and much more light-hearted adventure. I think it's justified and I don't find any problems with that.

The only shortcoming of this manga is that it's unfinished and there's no telling when it's going to be.

Nonetheless, the story ends in a good spot right now, so don't be afraid to read, it's not like you'll be left in the middle of the arc or on a major cliffhanger.