Thanks to sforza for letting me listen to these IEMs.
In a nutshell, the sound to me was bass then treble then mids. Really didn't like it that much, reminded me of the TF10s. He also brought along the Beyer DT250 and in contrast with the FXT90 - I liked the DT250's sound better which sounded more balanced even coming from just the Sansa Fuze.