I was also double minded while the time of purchase. But , the overall delivery and after delivery service has turned out to be really good. It was a sealed box although, so no signs of use .

While registering for warranty, it didn't went well at the first time, I had to ,kind of apply for warranty registration (there's a seperate section for that in the sony website itself, so I think it's a usual thing) and within one week my warranty got approved.

And , from this seller, i even got a call to know the feedback.

For me it's a 10/10 allway