i have one eonon E1062 for my mazda3 for nearly one year, it is very decent and worth the money.
but the E1062 dose not come with a built-in GPS function, i have to add an external GPS box to have the function. but it is a special car dvd series, perfect match with my dashboard. I love it.
Choose a product with a brand is very important, it means the quality care. i found eonon on eaby like u, however,finally, i bought it on eonon.com official, cuz it provide free shipping and 2 year guarantee while ebay doesnt.
hope it help~