So now I (finally) have Promethean, Mage, and the World of Darkness corebook. Still haven't had a chance to go through them properly. I'm half way through the core book, currently trying to work up the gumption to get through the combat section. Not that I'm not interested in it -- I'm intrigued by the system. I've never really looked at a dice pool game before, and this one has a number of features I quite like. Number one is getting to roll handfuls of dice all the time. I like rolling dice. And I like getting new dice -- I've only got six d10s at present, so if I decide I'm going to run these games I'll need some more.
I haven't even cracked Mage and Promethean yet, but I've already noticed one thing: these books have a very attractive feel to them. The corebook is about the size of the average D&D supplement, but the others are practically proper tomes. Particularly the Mage corebook, which is now the thickest RPG I own. I'm not used to it, and it gives the book an attractive heft and unusual feel. Vampire and Promethean are both about the size of the 3.5 corebooks, maybe a little heavier. Which still gives them a reasonable attraction, seeing as their dimensions match the first RPG books I ever owned, and the ones I've spent the most time with.