I have the opportunity to purchase a used 2015 13 inch MacBook Pro i7 16gb 512 ssd. The bottom panel (keyboard, trackpad and battery) have been replaced (3 battery cycles). The seller is asking $1400. Assuming the Apple repair paperwork corroborates all this (which the seller says it will), is this a good price? I went on eBay and saw these used MacBook pros going for $1400 to $2100. It's hard to tell what’s a fair price. I'm coming from a 15 inch 2012 i7 8gb 256. I wanted to upgrade and get a new mbp but I am leary of the keyboard issues on the new machines. Is this 2015 a good buy? Thanks in advance to all who reply.