I've always been curious about Sennheiser headphones but have never had a pair.
This thread pushed me off the fence.
I went with a pair of reconditioned (whatever that means) HD650 and they're a really good pairing with my Woo Audio WA6.
As previously mentioned, the soundstage isn't especially wide or deep but the sound is pretty well balanced from top to bottom.
I'm not sure how many hours these have on them so it's possible they just need some more time on them.
I've used Grado SR60, AKG 701, Beyerdynamic DT990 and Beyerdynamic Amiron Home with this Woo amp and these Sennheisers are the best pairing.
The Grados sound fine but they're built to a price, the 701s had a thin sound, the DT990s were quite good and the Amirons are too bass heavy for this amp.
I'll have to try the Amiron on some solid state gear, I think that's what they were meant for.
Thanks to one and all for getting me to stop thinking about them and actually doing something!