Mine's a mid-2012 model. I've been quite happy with it. I've long been looking forward to Apple coming out with a model capable of 32GB, so I would have upgrade

Mine's a mid-2012 model. I've been quite happy with it. I've long been looking forward to Apple coming out with a model capable of 32GB, so I would have upgraded immediately, but my understanding is that the new machines haven't addressed the keyboard dust issue. So I'm probably going to hold on to my 2012 for at least another year.