I think HK customer support is absolutely fantastic.
I recently won a FL8380 cd changer unit on ebay. Well, it arrived at home and i installed it. worked fine for about 20 minuts then started making a lot of loud noises, like the CDs were out of balance. I contacted harman kardon, and they gave me a free shipping label to send it back. They offered exchange or refund. added to that, when they got it, they not only refunded the purchase price, but also reimbursed me for the all shipping expenses, and also left positive feedback on ebay.
Also, one time i had a problem with my AVR130 receiver, and i called them. the very knowledgeable support was able to diagnose and fix my problem over the phone in about 5 minutes, and i've never had a problem since.