I have the VC1000 but haven't heard the DN-1000. The general consensus is that DN-1000 is an upgrade to VC1000 on basically all fronts - considering the price difference of around $90 it's a fair trade-off I guess.
I'll say a few comment on the VC1000:
1) They are incredibly comfortable, wearing them up or down I can easily lie on my side and fall asleep. I regularly use them more than 8 hours a day. They don't come with cable cinch, so I made my own using electric tape, and it works very well. Cable is surprisingly good for its size. Looks thin but very tangle resistant and doesn't kink easily at all.
12064873046_c00a6fabbf_o.jpg
2) The rubber tails/strain relief isn't glued on well to the wine-colored aluminum (?) housing. Mine came off after the first day when I was testing different tips. Easily fixable with cyanoacrylate-based glue (i.e. super glue, don't use polyurethane-based like gorilla glue, as it seems to dissolve away the material rather than glue it together).
12064272794_c7c05783f0_o.jpg
3) I settled on wide bore teal tips shallow insertion for the best fit/sound. Deeper insertion sounded way too artificial and the peak above 10k became much more pronounced.
4) I put on the tip differently than what's intended, I push the tips all the way to the bottom of the nozzle rather than stopping at the first ring. This tames down the treble peaks even further, and make instruments (especially violin and other stringed instruments) sound much more natural. Otherwise, they sound energetic with any synthetic instruments, but sound very weird for any instrument that's not plugged in.
12064242663_719f2326de_o.jpg
12064336964_e14f1e5743_o.jpg