Privateer Press has amazing support. When they released a new edition [MK II] it was obvious then some army specific books broke the game. Privateer Press released temp downloadable rules for all of the armies and released a high quality army book every 3 weeks until the whole set was redone.
Another awesome feature that I wished carried to gamesworkshop is that each unit that you purchase comes with card representations for fast access to stats abilities and damage counters.
The support PP shows to its customers is one of the things I love about them too. And the quick reference cards are a great addition to an already great game.