I do audio production. I use Logic Pro X. I use AU plugins and such. I am leaning towards a newer macbook air for audio production because I don't feel like spending 2 grand to get a quad. Gut then again there is the used market... Will an i7 quad core from 2011 run circles around a dual core i5 from 2015? if so... Why would anyone ever want to buy a macbook pro from the apple store when anything short of the $2000 models are blown away by computers that are nearly 4 and a half years older?!