What on earth are those things??!!
Talk about about complicated-looking and expensive!
We have used the Australian-made "Multitool" (by P.A. Products, Sydney) for years - excellent units! They fit onto one end of any 8"? bench grinder and use the 915x50 (3ftx2in) belts. They used to cost around US$150. They last for years and years, our 10-15 year old units still going strong.
One of the most useful machines you can have in a workshop - but not recommended for sharpening drills, toolsteel (IMO)
Some bench grinders are better than others for getting a linisher up to speed, if I remember correctly a cap start, cap run is best?
Edit: Just found this website, seems like they sell in the USA
http://www.ausmultitool.com/
You can fit a chisel holder attachment if you are into that, and a tilting table to suit the face wheel - things we have and never use...
This looks like the units we use, I see they are around $220, + adaptor kit.
http://ausmultitool.com/Item/MT362TG.htm