I got a really crazy deal on a set of new SRH840's and took the plunge. My source is either my laptop (don't ask), a Sansa Fuze, and an iPod.
I have a Behringer USB DAC feeding a Bravo V2 Dual-Triode class A tube amp. Very barebones Chinese 12AU7 delivering the tubeyness. Right now I have it hooked up to my turntable downstairs for some pure analog listening. Yummmmmmm.
Comparing against the UE TF10 and my recently acquired AudioTechnica ATH-AD700....
SRH840 is the closest in sound to the TF10. But here's the strange thing - the TF10 sounds like crap out of the iPod video and laptop but absolutely gorgeous out of the Fuze. AD700 and SRH840 are thin out of the Fuze and iPod, very decent out of the laptop, but amazing out of the Bravo.
Go figure....
Anyway, the SRH840 has a kinda flat soundstage on the Fuze and iPod, but it opens up a little on the laptop. Not much, mainly because the Shure, for lack of better terms, sounds very monitor-ish. It is detailed and non-fatiguing, but not _exciting_. Off the Bravo the soundstage really starts to pop out - I don't know if it is a result of the class A topology or the triodes or something else. The AD700, which already has a great soundstage (open, angled drivers, all that jazz) becomes almost 3D through the valves. Bass has better bloom as well, giving it more body.
Anyway, I am only a little surprised that some folks find the SRH840 bass lacking out of the Fuze. That combo just isn't impressive. I'd be tempted to think it is the tubes except that the laptop delivers the goods as well even though the Bravo makes the Shure sound even better. In my estimation, the Shure definitely has more bass oomph than the TF10, and the little IEM's already have more bass than neutrality.
Everyone already knows this... but the AD700 is far more comfortable than the SRH840. Lighter, more breathable, everything.