I've been using mine for about 10 hours on and off since yesterday. They go really well with the Zune (which has no EQ so I find the extra bass on the Klipsch a welcome addition.)
I prefer my Denon C700 with my Sony A808 and the Klipsch with the Zune. The one problem I'm having is with comfort!!
I know how to get a good seal - that's not the problem at all. But I'm finding it uncomfortable to feel them jammed up against my ear canals. It's like I've physically stuck my fingers in my ear and the pressure is difficult to adjust to. And my ears itch when they're in. I'm hoping it's something that will pass, because they really do sound very good with the EQ-less Zune.
One other thing - there was a card inside the package for 2 pairs of free gels if I registered with the website. So I registered and filled in all my details, then I lost the page and couldn't find it again.
Now when I log on to my account on the Klipsch website - I don't get the option to order my free gels


Oooh, look how tiny they are compared with the Denons.
