just bought a eclipse avn6600 on ebay for $512 ... is this a good deal? Anything I should know about this H/U before it arrives??

 

yes, most likely it wont be covered under warranty. Definitely verify that. I only ask because Eclipse warranty is a huge reason people buy their units over other brands, even though features are also amazing. The cost of repairing these units can easily jump to that price range depending on issue. If you dont care about that, then congrats on a great price. This looks to be the best head unit on the market when you compare price to features.