Hi guys,
as promised weeks ago, finally here comes my update.
I got my replacement device (13" haswell rMBP / 16 GB RAM / 512 SSD) on November 19th. Unfortunately due to a lot of work i was not able to really test it out for almost a week.
But by now - December 6th - I have tested it quite a lot and here are the results:
1) Ghosting / Image retention: none! Since I now have the possibility to compare, I can tell for sure that my first device did have IR-problems. I could not reproduce any of the ghosting images which I had on the first device. Super!
2) Keyboard/Touchpad: When I received my new rMBP, it did not have the EFI-Update installed. I was happy about that, because I wanted to know ...
And after using the rMBP for a few hours, I had a typical freeze. Closing the lid for 3 seconds helped.
Now, this was actually good news for me in a way. Because it did show that it was not simply a bad batch of some devices. Remeber, my exchange device was produced weeks after the first device and it was produced after the issue was well known to Apple and the EFI update already out. Bad hardware (either by design or by bad assembly) would have been fixed by then.
Of course, after the freeze, I installed the EFI update. Since then, no problems. No freezes.
I now use this device on a daily basis for about 10 hours a day. I have to admit that I have USB-devices (mouse) plugged in quite a lot, but still I should have used the rMBP without USB-devices for at least 30 hours by now. Without any freezes or lockups.
So I am really happy by now with my 13" rMBP. Display is perfect, no problems with keyboard/touchpad and also none with WLAN (which my first device had) and a normal, apple-like keyboard with no cheap-sounds or anything alike. And the battery lasts 9-10 hours when using the rMBP "in a normal way", meaning without using Flash-plugins on websites. (They need a lot of CPU power and therefor a lot of energy)
By now, from my peronal point of view, the 13" rMBP is safe to buy and a really great laptop. Every day I use it, I like it a little more.
I did read about some people still having problems after the EFI update. But I haven't read whether it's still a simple freeze of keyboard/touchpad (and otherwise the system is up and running) or whether these are "full crashes" meaning everything stalls. The last would more point into a direction that they are simply having a crash of the OS, which can have a lot of different reasons.
Of course, since I believe the EFI updates might raise some internal tolerance values, there might simply be some devices that even go above these tolerance borders. But from what I read, these are rather few devices. Of course, I would recommend anyone who did install the EFI update and still experience problems to return it right away. Because obviously there are a lot of devices available, which do not have the problem anymore after the EFI update - so it's always better to have one of these.
And if 14 days are over already, I wouldn't care about it. Spending a lot of money and the device doesn't work like expected even after the EFI update would make me say to Apple: either you exchange this now or you definetly lost a customer for good.