I purchased all four of the Villains and Lairs supplements yesterday, based on... well... a hunch.
Wow, was that a good hunch.
I've only had a chance to peruse all four of them, and I will be digging in further. But this is some of the best supplemental content I've purchased yet. This stuff is GREAT, and as a DM who's getting back into D&D after a 15-year layoff - and suddenly finds himself at the helm of two different games - having this stuff available to either use, modify, or spark my imagination, is going to be invaluable. Every NPC I've seen in these guides so far has some sort of spark, or twist, or perspective that is unique/different. They're giving me all sorts of ideas. And that is awesome.
So - thank you very much for this. Money very well spent, and I will be eagerly digging through the rest of your catalog.