Need for speed...I typically have 5+ windows open all the time so speed suffers and the 8GB the laptop came with was slowing down. The price from iFixit was good, warranty great, and the directions simple.
Almost without a hitch. I have oversized fingers (size 13.5 wedding band) so it took a little effort to get the bottom board in slot, Otherwise it was as easy as changing RAM in a desktop unit. The instructions from iFixit helped in finding things like the battery connection and precluded taking any unnecessary actions.
Be sure you have the right screwdriver and pry tool. I got both from iFixit, I suggest people do the same.