I've had my eye out for a decent shape old treadle sharpening machine. I've seen some losers recently at antique malls priced between $120-$250. The $250 was in OK shape, but someone had JB-welded the stone to the axle to make it appear solid. (And I hate it the seller feels the need to lacquer over all the rust.)
I have a Tormek, and several whet and oil stones, and several bench grinders (1725 & 3450 rpm).
However, the idea of a treadle sharpener intrigues me.
Do you have one and use it? Don't use it? Likes? Dislikes?