I am really impressed with my 11 inch MacBook Air. I am currently working on a track on Ableton Live and with 7 tracks the CPU meter is between 14% and 17% and that is with reverb effect on one track and phasers and delays on other tracks. This is really impressive considering the size of this baby is no more than the size of a netbook. The intel core i5 and 4GB ram makes a big difference. Propellerhead Reason 5 is also great on the MBA. I will be testing Logic Pro soon.