Ouch. Pretty assholish for Paypal to call it the Buyer Protection when it only applies to Ebay purchases. I have to think that is intentional double speak. IF they wanted to be clear why not have Ebay Buyer protection policy and Paypal General Buyer protection policy.
So looks like your rights for non-ebay chargebacks are next to nothing. If I am reading that right, from that email it looks like the seller could ship a brick (literally) and you would have no resource. Sound about right?
I have no worries though since I cancelled my order. Not mainly because of the above, but because I don't want to spend almost $600 on this kind of hardware even if it is legitimate. If it is, then the difficulty isn't going to stay this low for long, and this device won't even pay itself back in the 7 months I originally figured out. Plus Bitcoin prices could fall, or any other number of things could go wrong, resulting in a loss from an investment like this. I think I'd rather get an FPGA myself and play around with if I really want to have low power mining. Seems more fun and cheaper too (if I can get some educational rebate).
Oh, and the cancellation was swift, and the response polite. PayPal has already notified me that my payment has been refunded. I'm not sure yet that these guys are legit, but if I had to bet my money on something it'd be that they are. They're just too polite to be scammers! (yeah yeah, I know )