A year back I replaced the battery on my 2013 15" model - like the other commenters, I paid $199 at the Apple Store for a new battery, topcase, including keyboard and trackpad. I also recently bought a used 2015 Pro on ebay as a backup. I have a 2016 13" touchbar pro, and after replacing the original keyboard, I'm actually quite happy with it. But for the 15" model I just don't think the price is justified given the specs... my next mac might be a Thinkpad with Ubuntu and virtualized MacOS, sorry to say.