Ice won't help B&W but having it isn't a bad thing, in the event you do get around to shooting color or scanning for a friend.
Having recently owned two (2) 5400II scanners I'll say with relief that my Nikon V is an excellent and rugged tool and the Minoltas were, uh, um.....not. However I'm sure a functional Minolta will scan equvalently to the Nikon, if you happen to come across a functional Minolta scanner.
Comparing 5400II, Nikon V, and Epson 3200 (flatbed) scans of the same negative at maximum resolution (purported 5400, 4000, and 3200ppi...I don't believe any of them), yes, the flatbed is at a disadvantage. But it's certainly capable of handsome prints at and above A4 with most images...particularly with portraits. It's very good with 6X6 and 6X9 as well, especially with the custom anti-newton carrier. I understand the 4870 is significantly better, but the 4990 may only be a slight improvement over the 4870, and not in sharpness.