I'm just noticing a few bugs, thought I'd report them. I had to use FormID finder and RefScope to find this.
Spell XX002564 has no name, shows up in the player's spell list.
Clothing XX001652 SpecialDeathItem shows up with 'no mesh' errors in a random part of my landscape (near Kvatch), and almost always crashes if I get too close to it. There are OOO carrion rats close to it, so apparently something died, but...ah, getting this in other locations (even 'off the normal grid') as well where some living person has died more than a day ago or so.
Contrary to the manual, if you 'sip' on someone, good rating doesn't increase, and drinking from dead bodies decreases both scores by the same amount.
I was also having trouble finding blood vials, let alone empty ones. If I try to drink from too many corpses, I start getting 'blood' potions to use later (and can unbalancingly sell for a fortune; I understand things are beta), but never any blood vials. In past versions, it was (presumably) possible to buy these blood vials, but I'm not noticing any. Are you expected to steal/loot them from other NPC vampires, or...? Given that it says blood vials make you sick after 2 days, does that mean you need to get more, or can you pour out the bad blood and make it empty again?
That said, this is my favorite vampire-related mod. It's gone out of the way via OBSE to be non-breaking, compatible, and integrated part of the game, with tangiable benefits/quirks, but meaningful drawbacks and limitations, too. 0.9 is rather must-have for that reason. Another question if I may, though. Are you planning to re-add the deep morality perks/thanes/whatnot to future versions at some point? I don't think that was covered in anything I've read. Kudos on the good work, though.