There has been a gap of a whole year since the last post and there may not be any interest in the topic any more but I actually read this thread before deciding to buy Komputerbay RAM. Komputerbay 16GB RAM was the cheapest available on Amazon (and elsewhere) as of September 2013 for my MacBook Pro 15 inch (early 2011). I have to admit I fell for it to my eternal regrets.
Upon installing the modules I started encountering kernel panics, which I had never had before. I ran Apple Hardware Test and found errors with my hard drive. The memory test passed without a glitch. Being inexperienced, this led me to believe that there was something wrong with my internal hard drive, which I thought was somehow triggered by my opening the lid and touching the internal structure, albeit only the memory module. Restoring the original Apple memory didn't help, which reinforced this misconception. Anyway, since I needed more hard disk space, I installed a new hard drive, after which kernel panics kept happening (even with my new hard drive). It was then that it dawned on me that the faulty RAM must have corrupted and kept corrupting files on my hard disk. After fixing the fault with DiskWarrior and with the original RAM restored, I have not experienced any problems.
So the moral of the story is this: you pay for what you get. Even though the advertised specs match those of my MBP, it was a disaster. I had to fork out for DiskWarrior, new hard drive, hard drive enclosure, etc., etc., though admittedly in hindsight I would only have needed DiskWarrior to rescue me out of the situation. So if you are tempted by the competitive price of Komputerbay memory, think twice. Pay 20% more for a more reliable brand like Crucial or something.