My order was cancelled for a 2.3ghz mid-2012 Macbook Pro with OS Mountain Lion (but could have upgraded to Mavericks). The company I ordered from offered a 2.0ghz late-2013 Macbook Pro with OS X Mavericks for the same price as an apology. I'm wondering if it is a good choice to take it? I intend to use the laptop for design programs like the ones from Adobe Creative Suite (or Cloud). Not so much gaming. There are various differences between the two, but many more similarities like getting 256GB flash storage and 8GB memory. They are both Retina versions. The biggest visible difference to someone like me is the .3GHz in the processor. Will that make a huge difference? The graphics of the newest version has been upgraded as well. "mid-2012" Intel HD Graphics 4000 --- > "late-2013" Intel Iris Pro Graphics NVIDIA GeForce GT 650M with 1GB of GDDR5 memory --- > (none?) The battery power seems to have been upgraded, too.