The Nikon Scanner is old technology, but don't let that fool you. There is not a flatbed scanner that will come anywhere close to it. What flatbed will allow you to scan in RAW? Well the Nikon can. The DMax on the Nikon is slightly higher - 4 (flatbed) against 4.2, not a lot, but enough to make a difference. Apart from all that there is no problem with out of focus negatives, the Nikon auto- focuses each frame before each scan. No flatbed I know can do this. The Digital ICE cubed correction software will correct negative faults far better than any flatbed. If anything it is too good. Do I need to say anything about the Nikon APO lens that is used by the scanner.
The only 2 downsides I know of against the Nikon is the scanning is not the quickest, and the Nikon software will only use Windows XP but it will work as well if not better if you install Silverfast. But - oh - the results! A 35mm negative will give a file size around 24MB and a 120 square negative will give around 165mb. If I was in the market for one I know what I would choose.
I have just noticed the comment about repair. I don't know about over the pond from UK, where repairs/servicing are available by approved companies, so I'm assuming there will be the same in the U.S. I have a Nikon Coolscan V and have just had mine serviced, but only because it is 'getting on a bit', so I thought a service and a clean would be beneficial. There was nothing wrong with it apart from a bit dusty inside the workings and the lens had a atmospheric film over the front. The full resolution scan even with 35mm will easily give me an A3 print and some left over so just think what a 120 neg will do!