Since entering a new business venture, I have put my photography on hold and these D1 kits have been sitting unused for at least a year. Both of the kits were purchased about 2 years ago and were used off an on for about a year. I would estimate that each kit was used for 20 portrait sessions -- not a full time job obviously.

Overall, the kits are in excellent condition, with evidence of wear most prominent around the silver rims at the edge (the mount interface). I have never replaced either the flash or modeling bulb, but when last used, they functioned without issue and a quick test today revealed no problems.

I am selling the D1 500/500 Air kit for $1699 + shipping, and the D1 500/1000 Air kit for $1849 + shipping. I am located in New England and the units can be picked up locally either in Cambridge or RI. No fees for paypal.

Here are pictures for the D1 500/500 Air Kit:
500_500 by cgthanos, on Flickr
500_500 1 by cgthanos, on Flickr
500_500 2 by cgthanos, on Flickr
500_500 3 by cgthanos, on Flickr
500_500 4 by cgthanos, on Flickr
500_500 5 by cgthanos, on Flickr
500_500 6 by cgthanos, on Flickr
500_500 7 by cgthanos, on Flickr
500_500 8 by cgthanos, on Flickr

Here are pictures of the 500/1000 Kit
500_1000 by cgthanos, on Flickr
500_1000 1 by cgthanos, on Flickr
500_1000 2 by cgthanos, on Flickr
500_1000 3 by cgthanos, on Flickr
500_1000 4 by cgthanos, on Flickr
500_1000 5 by cgthanos, on Flickr
500_1000 5 by cgthanos, on Flickr
500_1000 7 by cgthanos, on Flickr
500_1000 8 by cgthanos, on Flickr