Take note that a good deal on 1" wheels can be had here:
http://www.surplussales.com/Tools-Accessories/T-Aabrasives.html
$15 for 50...
The ones I got in the bag are 3M branded...
I have a few of those and use them only rarely. I don't have a Scotchbrite grinder wheel and have never seen a need for those.
Personally, I think that a good Vixen file, a couple of mill files and a set of small shaped files are all that's needed, plus a set of deburring tools.
I'm building an RV-3B, so I might have more need for tools than some of the other builders, but Scotchbrite wheels are only needed, in my opinion, for dressing out dings and goofs. For that, they excel.
Dave