The ebay dude seems to have a great feedback so i dont think there is anything fishy there. JBL's are a good speaker but you wont get megger sound out of them dueto there size. They will however be an improvement on the standard 6x4's. Also living in the rear quarters does the speaker no favours. Lets just say you had 6x4's in the front door cards then upgraded to the JBL's you would notice more of a differance than putting them in the back.
Anyway after all that......get them
