Summary: Purchased this when a cheap plastic gear in my Scanjet 5370C wore out with no way to purchase replacement. I have no 3D printer, which could easily make a replacement gear. There is an image of a giant lollypop labeled "Sucker" floating over my head next to the image of a giant wood screw.
Pros: Produces 6-color images. Two lamps, one infrared (or ultraviolet?) for removing scratches. 4800x9600 resolution. Does lots of 35mm film and slides at once, so says the advertisement.
Cons: Violet-blue-grey vertical streaks washes white documents. Even with nothing on the scanner glass, the white paper press does not scan in white. Easy to fix in GIMP, increase contrast to +60%; not willing to experiment with color photos.
Summary: Don't waste your time with the buggy and poor quality HP software. Get VueScan Pro and you will be happy. After much tinkering, I am able to scan negatives and get good results, although it takes a lot of time at a decent resolution. Also, I am observing what appears to be a shadow effect caused by the IR dust removal. You see the dust spec, then you see its shadow. Saw this at 4800 dpi, but not 2400.
Pros: When you actually get it to work, it makes decent scans
Summary: The scanner does beautiful work! The only thing I can complain about is the TMA adapter. I can't figure out how they want you to use it.. I found it very difficult to use for scanning slides. There probably is a way to use it; so I will have to call HP to find out how to use it. In the mean time I am using a TMA from my last HP scanner for slides. If you don't have an old TMA adapter, it is a big deal if you want to scan slides.
Summary: Our unit has been used in a healthcare office for the last two years or so. Easy to instal and has proven to be a real workhorse. Never a problem. A bit noisy but nothing to keep me from purchasing again.
Summary: Loved this scanner until the 10.9 Mac OS X upgrade came out. Now, I can only scan pictures and documents with the scanner. No negatives or slides because the driver and HP Scan software is not compatible with Mavericks.