512 gb 8gb Space Gray Pro owner here. Everything is so seamless. It's unreal. Granted, I do not run windows or any complicated programs. I am blown away. How can this be a first gen machine? I am now trying to figure out what to do about my other MacBooks because all I want to do is use this one. I am in love. Logic tells me I should return it and get the second gen version of it and I will eventually run into some major problems, but I don't want to take it back lol.