I've purchased all of my head units from ebay.... 80% of them were great and the other 20% were average to below average. All of them were Alpine.

What model are you looking at and for how much??

Model is the key here. I only bought Alpine decks because I knew they were solid, and even though they were used, they were still gonna work and keep their value. I was able to sell some of those decks later on for the same price, and in a few cases, a little bit more than what I paid. So defnitely make sure you're buying something that has a good reputation.

As for price, check ebay. ebay is an excellent source to see what market value is. Also check online sites to see what the deck goes for brand new. Is it really worth buying it used to save $50. If it can be bought Brand New for say a $100 more, then get a new one....

Lastly, get pics so you know exactly what you'll be getting. In addition, I always ask the standard, "Is everything included like: trim ring, faceplate carrying case, mounting cage, wire harness, remote (if applicable), manual, box."

This should do it...:thumbup: