First things first, this game is tough, not unfairly so, but in an age of continuous save points some modern gamers may be a little put off by having to restart after each death, but one thing's for sure you'll value your 'life' all the more for it!
Great game, nice hack/slash/spell casting action RPG which, if you so choose, is as deep as an abyss. The supplied strategy guide is testament to this but, unless you're going to play through with it, I'd leave it alone until your second play through and only use it to get you moving past parts you really can't do.
Only on the second world myself but loving the game, thankfully I found a Bastard Sword on the first proper level, which has saved my bacon with many a harder villain!
Bottom line, buy it. If you're an action RPG fan you'll love it, if you've never played one, you'll possibly never play one like this ever again!