People be like - "I'd assemble it for under 500 bucks"!
Hehe. I'll just be late...
I get £721.78, for two drivers, complete headband, pads & cable, minus special male connection plug and case.
I got excited until I realised I'd forgotten to add the headband.
Still, it's a fair bit better than £999.99.
I just received my 650's, which are my first pair of Sennheiser's, something I have been looking forward to for awhile after seeing all the praise here on Head-Fi. My immediate impression is that they sound great. I'm just using a cheap little SMSL that I just got, so not sure if I'm getting the full effect yet. Later tonight I'll try them at home on my Bifrost + Vali combo, and see how they sound there.
One thing I'm noticing right off the bat tho, if I have them actually sized to fit my head snugly, they REALLY hurt at the top of my head. I have to loosen it up a bit, which isn't really a problem, just surprised me how tight they can be when actually fit to size.
I don't think it's very bassy. The sound signature is very similar to HD650s (rather than HD800 which is similar in name) and while it has plenty of bass, it never results in recessed mids or treble. The sound is very musical, engaging and fun, also very detailed and transparent. Like the HD650s, I can listen to them for hours without any physical discomfort or ear fatigue. They are the most comfortable and best sounding IEMs I've tried. Also they look very cool. I'll say that though, if you don't like bass, you won't like IE800s. It's not that they are bassy but they aren't thin and analytical sounding. If you like HD650s, you'll like them 99%.
From home to work and back, I have a driver so I sit on the back of the car and listen to IE800s without moving at all myself. I didn't try listening to them whilst walking, at least not for more than 10 minutes, I don't enjoy music that way. However, some say IE800s have bad microphonics. While I haven't had such issue, I'm not the right person to answer that question as I didn't walk much whilst using them.