A few people have been scammed on the site, Only use paypal to pay for items for sale by other members. If they will not use paypal, its likely a scam NEVER SEND E-TRANSFERS OF ANY KIND.
I've tried Loobman and Tutoro Auto is way better in my opinion.
Also from my experience the front sprocket is first that shows signs of wear. Chain may look absolutely fine when front sprocket is gone.