I ordered 15" RMBP with full Early 2013 CTO spec (2.8ghz w 8mb cache, 768GB SSD) But I am wondering to return the item because of the following options compared to Late 2013 1) Battery life - 1 hr difference on integrated graphic, now I will tell the difference since it's noticeable by anyone. 2) CPU power - Early 2013 w 2.8ghz w 8mb cache vs Late 2013 w 2.6ghz w 6mb cache. Would I be noticing some difference like battery life in person when I try to import photos / encode? Like would there be at least 30sec difference? (if it's more than 30sec then I'll consider it different) 3) Heat/noise - I've been hearing here and there that Late 2013 both has reputation of being cooler/less noise than Early 2013 as well as the opposite. So at the same time I've been also hearing that Late 2013 has higher TDP thus can provide more heat/noise than Early 2013 in certain situations. How different will this be? 4) SSD speed - Now technically Late 2013 is almost twice as higher than Early 2013 in terms of read/write speed. Since if I buy Late 2013 I'll buy 1TB SSD and higher storage = even faster speed, in real-life usage would I really be seeing some difference in terms of like 10~20sec difference in numerical explanations like battery life? Like waking up from sleep, booting up, transferring files and etc will be much faster than early 2013? Since those 4 are my main topic, I really want to know if that is worth extra $700 seeing the difference noticeably in real-time usage. I'm not rich or anything but I just want to make sure if those 4 are definite worth of extra $700 Please give me some advice as I've been hearing that performance-wise I should be seeing about 10-15% difference. Thus I am so confused! Thanks!