This discussion is starting to be funny. We know very well that in the beginning the new Macbook Pro 13" Late 2013 had problems with freeze and after the EFI update 99% of MBP 13" Late 2013 had no issues anymore but let me add some other staff... Not only the new MBP Late 2013 had this issue but also other older MBP and iMac and all these older Mac had no issue using Mountain Lion, Lion but the problem started with Mavericks release. So about the theory that some IC components inside Mac have values closed to the spec limits and they can cause this kind of issue could be real but i want to underline an important aspect because i know very well the market of semiconductor...
Do you think that Apple continue to use these IC with value closed to the spec limits inside the new assembled MBP (ex. assembled in February or March etc...) and it continues to lose money because customers give them back ?
In my opinion Apple would have asked to supplier a new "Pack" of IC with values far from spec limits and used them in the new Macbook etc... But some people continue to have this kind of issue with new assembled machines.
Maybe Apple is not using these IC in a proper way or the firmware is not total bug free and another update should come out in the future. Only Apple engineers know this... I think that there is something wrong inside Mavericks to save battery life because some older MBP had no issue before Mavericks updated...
I bought my MBPr in the end of October ( Day one), i had only one Trackpad/keyboard/freeze during my second day so i initialized SSD, reinstalled all OS X and all worked good. After the EFI updated i installed it and had no issue, until today all is working perfect, really happy with my MBPr Late 2013 13".
If you need a new machine don't hesitate to buy it because i don't think that Apple builds bad hardware... but you know, that's only my opinion.