I have a 2012 MacBook Pro .. and it's been great over the past 2.5 years .. I use it everyday .. it's my main workhouse/desktop-replacement computer .. so is it worth upgrading to the 2015 rMBP? .. or shall I wait for a more significant update? .. I have 8 GBs of RAM and a 256 mb SSD, which are more than enough for me .. I'm very happy with this machine .. will I be even happier with the new one? .. faster ssd, better battery and the trackpad ..