Help me to decide about 'Heroes of Ruin'

[Mnementh]

I'm undecided, if I should buy 'Heroes of Ruin', which will be released here in Europe in on thursdayfriday (I really should learn to read a calendar).

First I was: YES! A RPG from Squenix  for the 3DS. I want to have.

Then I saw the first videos to promote the game. They lost me on the possibilities to change hair color for your character. Really? I didn't watch another video. But last week came the demo. I downloaded it and played it, and it was nice. Much like Diablo.

So I'm now undecided. Help me to decide this.

As I like online, I prefer the Solo-Mode. Is the solo-campaign big enough for some playtime? Do I have enough savegames to try out all four classes, without overwriting another char? Is it worthwile the price (40€)?