For an older camera body these days, this model still performs well. THe build quality is impressive. I have had this body on hikes, climbs, rafting, and boating trips and it has never let me down. It has been banged around, subjected to temperatures from 115 down to -20 and it performs like a champ. Before buying this body from a member here on the forum i was considering the Fuji S3, D80, D200 and even a few offerings from canon. I am glad i decided on the D1x.
For being a small MP body compared to the new stuff out there, it still generates great large prints and can even be used as a 10MP unit with the right software. As a convert from the Canon system, I found the controls on this (and most nikon bodies) to be well laid out ergonomically and very easy to use. I like that it feels to me to be more like a film camera layout with the turret on the left side of the body and all. Canons feel to me to be laid out more like a consumer grade point and shoot. I have found the images of the D1x to be very sharp, the AF is accurate if a bit slow compared to modern offerings, and the metering is spot on 99% of the time.
The problems i have had with this body are battery life and white balance. The battery lasts me maybee 400 frames with smaller ultrasonic lenses and about half that with my big old 80-200. The white balance usually remains set at "cloudy -3" which works for most of my landscape work, but the auto WB is a joke. Shoot RAW and this wont be a problem. Proper charging and battery care will help greatly.
I would highly recommend this camera for any work not requiring billboard size enlargements or super high frame rate. Keep a few spare batteries and get used to judging white balance and this camera will never leave your hands.