The issue I see with the new MacBooks is that they cannot be upgraded. So if I bought a model with a 128GB drive I would be stuck with that. Am I correct? Also why has apple downgraded on disk space? I see that the traditional models with DVD ROM drives are being discontinued and no longer being made. Is this correct? I have a mid 2009 MacBook that has been upgraded to run Yosemite but at times it gets sluggish, and launching Office 2011 for the first time is slow.