I'm into any kind of a deal on Amazon, but my interests happen to be a little obscure. It's a bummer because while I'd like to order some of the things they put into the deals, I really have no use for them. I still like getting their emails about what's on sale today, but I wish they had more variety!
Amazon Warehouse deals are excellent. Most of the warehouse deals are new or like-new products. If a customer opens an item and returns it because it doesn't fit / is the wrong color / etc, Amazon lists it as a "Warehouse deal" - it's basically like new in most cases. I've ordered hundreds of "Like New" and "Very Good" warehouse deal items. I won't risk it on electronics, but things like furniture (two lamps, a box fan, and a desk) is a great deal on warehouse deals. Out of the hundreds of warehouse deals I've bought, I've only gotten burned ONCE. Someone clearly bought a set, took out the one thing they needed, and returned the rest of it. I contacted amazon and they shipped me a brand new set as an exchange.