Having imported it form Asia, I have played it for a while and I love it. It's very hard, but seldom unfair.
The combat feels great and authentic, there are lots of different weapons that all handle differently.
The levels can seem very straightforward at first glance, and getting through them isn't all that hard, (apart from having to start over everytime you die of course) but there is a ton of hidden treasures and secret passageways that you can miss if you don't explore carefully.
The boss fights are probably the best part of the game. Most of them feel like Shadow of the Colossus on steroids, and while it might not be hard to figure out how to fight a certain boss, actually doing it can be hellishly tough. But the sense of satisfaction as you finally deliver that killing blow is damn near unparallelled.
It's a hard, but awesome game. If you're into action rpg's, I strongly recommend it.