There was not much of a difference in Apple ImageWriter IIs. The rollers tend to go dry and back then was to remove them and wipe them down with baby oil to restore it. There used to be a "trick" on the Computer User Groups' News Letters on taking the rollers out and sanding down the hard crud that the rubber made when it dries out - that never worked! Also the fuse in the leg that had the power plug blows out on some of them.

I like the ImageWriter IIs because they can print in color with a special Color Ribbon but the ribbon was expensive and only lasts a short time. The ImageWriter were quieter though. Great for long print outs of code!