The two sides are foil, aren't they? This was given to me, I didn't buy it
yes, they're foil. Braun foil (at least when I still shaved) was considered to be problematic by almost everybody since it is sharp enough to cut on its own, without the blade underneath, thus not having the required scissor like motion, and more a razor like motion. this is the potential issue with lift and cut as well; the 'lift' is pulling the hair through the screen, where it is being cut by the blade, possibly without the screen acting as the other part of the scissor. With the foil it was a much higher chance of that happening since it was on the outside.
I've been out of the parsha for a while so I might be totally outdated, going for the caveman look now.