any reason NOT to upgrade a tablet from 8.1 to 10? The tablet is mainly for couch surfing but does have MS Word on it. I have been avoiding the upgrade just because of the hassle factor.
If you're willing to take the (small but non-zero) risk that a roll-back doesn't work, I would suggest the upgrade. IMO Win10 is substantially better and easier to use than Win8.x. I'm personally a Win7 fan, and I found Win8.x unusable. But I've been working on Win10 for many months now and it's quite usable once you get used to it.
Also, the "Classic Shell" add-on program is a true life-saver for those of us who prefer the Win7 style UI.