I picked up a late 2011 MBP and it came with 4 GB of RAM. The MicroCenter guys went and brought me an 8 GB kit which I put in on the second day I had the machine. Then I started reading online about how Apple "recommends" 8 GB but people are having good results with 16. So I stopped by MC and picked up 16 GB of Centon DDR3 1333 RAM. I've been busy so I just got around to installing it tonight. And that's where the scare begins. I was "too lazy" to flip the machine around so I could see the socket. What could go wrong, I thought. Yeah, right. I found that the memory was all the way in, tilted down toward the front of my machine but not really making any electrical connections. I wondered why Apple would design it like this? You can insert a stick of memory and if you aren't watching closely, it gets "jammed" inside your machine? So I went and found a small ty-wrap and fished it underneath the memory and pulled it out slowly. It was in there about has solid as a hydromatic transmission gets bolted to a big block engine. Once I had it out, I flipped my MBP around so I could see the socket, PROPERLY SEATED THE RAM and pivoted it into place. Now there was a whole 1/8 inch above the RAM. I added the second stick, turned on the machine and waited for the notification that only one stick was working or that I had damaged something during my prying to get the first stick out. Happily all is well and while my geekbench scores have dropped 30 points or so, I find that Chrome with 30 tabs loads in under 10 seconds. And I haven't gotten around to any kind of hybrid SSD or full SSD upgrade yet. Scary but worth it. I'm posting this as a warning to others. Why screw up if it can't serve as a warning to others? If you install RAM in a 15 in MBP, make sure the bottom stick is seated before you snap it in or you'll be looking for a way to pry it back out and seat it properly.