Okay, just got my FX101s.
So far, I like them. They've got lots of bass with nice sub-bass extension. Mids sounds pretty good as well, still need some time to determine. The highs are decent and detail is good, if there is any sibilance I don't hear it because I listen at relatively low volume levels. Overall I'm happy with my $15 purchase, we'll see where these things go (maybe with some burn in).