I bought a HDHomeRun at some point in the past. It works ridiculously well with MythTV and helps add to the distributed network that is our home.
Recently, the power supply seemed to give up the ghost. The little red light on it was flickering on and off, and the unit became unresponsive. On the weekend, I finally got around to filing a ticket with SiliconDust to enquire if I could purchase a replacement, because I figured the entire unit was out of warranty by now (I said as much in the ticket).
To my surprise, I received a reply telling me that based on my device ID, I had a known-bad power supply, and I was directed to fill out an online form to get a replacement one shipped to me at no cost to me.
Nicely handled, even if the website was littered with spelling mistakes.