Why is there so much advice against an i7 configuration vs an i5 for the retina macbook pro 13 2015? Surely the extra level3 cache is beneficisl to developers and design work? Is the argument purely value for money ie 5% geekbench improvement for £200 ? Does battery life suffer much under low intensity usage (web email etc)? UPDATE- to be clear .. My query is about which scenarios benefit from an i7. I'm interested in rationale and evidence vs 'you won't notice it' Update 2: working with several (3-5) virtual machines is a scenario. Clearly ram helps but what is the effect of i7 over i5?