I recently tried
this recipe for beet chips, and have finally found a preparation that I like for deep red beets. I used a mandolin to get the slices so I could be consistent, as suggested by the recipe, I did some 1/8 inch thick, and some 1/4 inch thick.
The quarter-inch slices tended to burn before they crisped, so unless you want your chips somewhat meaty and wet, I'd suggest sticking to thinner slices. I used the waffle-slicer on the mandolin just for fun, and it worked just fine - but a hearty sharp knife will work just as well. The mess wasn't as bad as I feared, either - raw beets aren't nearly as juicy as cooked ones - yes, my hands were stained, but returned to normal after a scrub or two. I mandolin-ed over a ceramic plate, and the beet juice rinsed right off - but I would be very aware of protecting porous surfaces when you try this recipe.
These taste just like candy, and, really, they were quite simple - we finished off four good-sized beets between the three of us in a matter of minutes, and none of us are beet lovers.