Bought this unit recently and have to say am very disappointed with the results. Ease of use is amazing; load a negative strip into the holder, push through the scanner one by one pressing <scan> at every frame, images save to an SD card (which is not included but they're peanuts anyway) and transfers easily to a PC via usb/card reader. So far so good.
I bought this unit because I didn't want to have to line up thousands of 6x4s and 7x5s on a flatbed, crop them, rename them etc. Comparing the results of my ~10 year old flatbed scanner with outputs from the negative scanner, and my flatbed appears to be far superior; ie more detail and better colour integrity. Everything I scan with the neg scanner has a greenish tinge to it. Now I could probably reverse most of this in post-processing using software, but where's the convenience in that? Also, colour aside, the level of detail is just not the same as my ancient flatbed. I bought this unit on the basis of reviews on here, so I am posting this one to prevent someone like me making the same mistake.
If you have a large number of negatives/slides to create electronic copies of and are not that bothered about whether the colours are spot on, or the level of detail is high, this unit will be perfect for you. If however, like me, you're going to scan in years and years of valuable photos and expect the colours and detail level to be at least approaching the quality of the original lab prints, do yourself a favour and steer well clear.
I was so disappointed with the results I asked the seller to scan one of my negatives with another unit which he very kindly did, and got the same results. I cannot recommend this scanner at all and despite owning it at this moment in time, am currently scanning my precious back catalogue of photos on my trusty old flatbed instead, much more effort, but much better colour and detail. A wasted purchase for me, and suspect my expectations of this unit at this price-point are unreasonable.