This is cool, but I think it helps if you have a little background in the Reinen traits. I haven't really looked into them a lot (read: at all) and some of them were a bit confusing in definition. So I probably wouldn't hand this to someone who wasn't already into socionics. Which was probably the point, but nonetheless.

edit- Maybe I just over think when doing it for myself, because I tried it out on a couple of my friends and it worked really well. Also, the benefit of not having to select one for each pair is very nice as well, because I can skip over ones I don't fully understand.