You will think im insane but its true,i just switch from mba bought it in december 2013 mid 2013 version 4gb ram and 128gb ssd and i5 1.3ghz,yesterday i bought mbp late 2013 same configuration with 4 ram,128ssd both notebooks was sealed im the first one who open them,mba just feel a lot a lot more smoother then mbp,restarting is much faster on mba,opening a apps like iphoto its just flying on mba,opening a single photo is almost instant on air,on pro same photo needs to be open around almost 3 seconds,i want to say pro is working good but not like a air and not even close,i didnt want to sell air first and then start chasing pro for several days so i just bought pro right away and now im selling air (didnt want to stay without notebook for few days) im in country where there is no apple store thats why,so after using air several months i jump same day on pro and the difference is huge,i was wondering does mbp late 2013 ssd is hooked on pci or sata connection? I know for sure air 2013 ssd is connected on pci,but dont know for pro late 2013 ao probably that would be reason,a little dissapointed user right now i was expecting a slightly faster performance with 2.4 ghz cpu on pro...