yea, i went through it. Difficulty is like Demon's Souls, even tougher with some bosses. I recommend it, still a brilliant game for those who don't mind dying left and right lol.
Yeah so I've heard! It's fun to play a punishing game for once, though sometimes it was really frustrating - you play a level for an hour and then accidentally drop into some hole in the ground that was tough to see because of the darkness... the amount of frustration was immense at times
Part of why I used a guide while playing it was because it was so difficult and some important things were so easy to miss that I felt that the experience might be incomplete and very frustrating without it... The guide made it quite nice, though equally difficult I must say.