Bests & Worsts Reviews from Amazon

I ordered a Denon AVR Receiver through Amazon Warehouse deals. The receiver was used so I picked up the open box warranty for piece of mind (hoping to never use it). So about 8 weeks after it arrived the surround right speaker port quit. I switched cables, switched speakers, everything I could think of. I called Denon and their service . . .but they are about as helpful as a pile of rocks. So I filed the claim on Squaretrade and was rejected quickly? Why? On this used item they thought I had in-warranty. Okay, if I had one year warranty from Denon on a used product WHY would I need squaretrade? (Denon's paper sent to me clearly noted that it isn't transferable and only valid from authorized sellers) I emailed them several times, but never did get much of a reply. This was pretty frustrating, especially for a 500 dollar receiver. So I emailed Amazon.com for help. As always Amazon stepped up. Opened up the return window, provided me with a shipping label. did everything to make it right. So in the end I wasn't stuck with an unusable warranty and a receiver that only worked 4 out of 5 speakers. This time I skipped used, and bought a brand new Onkyo as a replacement. Right now I'm just trying to get squaretrade to give me my money back. . .since I feel they didn't honor our agreement (and I don't have the receiver anymore) Warranty's are all five star, until you have to use them.