I am not familiar with those particular scanners, but I did have a PrimeFilm 3600U. It only managed a few rolls of film before breaking down, so that completely turned me off of any of the company's other products.
As for the Braun Multimag SlideScan 7000, this review says it is effectively only 5000dpi even though it is advertised as 10000dpi. The rest of the review appeared reasonable. Though it may be a perfectly good product, I see misleading advertising as a red flag.
All scanners include some sort of software, though often they are little more than glorified drivers. This is the case with major brands as well.
Infrared channels are to assist with dust removal. They can be very helpful for color film.