I've been digging mine too, pretty decent V shaped frequency response. If you havn't yet, try out the Comply Foam tips, that's how I get my favorite sound out of them. I've been using the TX-500 tips for awhile and really like them!
It's UE you love for the triple.fi! Logitech may have bought them recently but they had nothing to do with the TF10's development.
I am very much hoping that Logitech's quality is dragged up from buying UE, as opposed to UE's quality being dragged down!