I'm picking up games for my GameBoy Advance SP. I was looking for pinball games and discovered "Pinball Of The Dead" by THQ Games. Combine House of the Dead and a pinball machine, and this is what you get. I checked out the ratings at Metacritic, where they cross reference game review sites. Very useful. Ratings were good.
Unfortunately, the game is no longer in print and all the used copies have no instructions. So I send an email to THQ Customer Support asking how I could get a copy of the manual.
Within 30 minutes, they had responded by mailing me a PDF of the manual.
I was pleased and amazed. This is how you get and keep customers.