http://www.tienda.com/food/products/cf-05.html
I'm thinking I might order some.
I know this process is actually used in Spain and elsewhere, but overall,...
Scam. The mist of sugar disguises the bitterness inherent in stale coffee. Unless they get it to you within 72 hours of roasting it, it will be stale. Unless of course, they package it in a state of the art, vacuum sealed container. It's likely roasted, then allowed to "rest" until the gases aren't coming off so fast, then packaged by machine, and shipped out. Which, unless you pay a bunch for overnight, means it's past prime by the time it gets to you. I'm sure the glazing does have an effect on the coffee's taste, since it would change the chemistry of the roast somewhat. But coming from Spain, any difference is likely to be lost by the time it reaches you.
Honestly, you're better off roasting your own, if you want coffee that isn't bitter. As for body, that has mostly to do with the beans themselves, though roasting time, heat etc can have a small impact.
Got a heat gun? There's an instructables for home roasting using one, or you can pick up an air style popcorn popper for five bucks from a thrift store. Or use an iron skillet on the backyard grill. Coffee Bean Direct and Sweet Maria's are my two favorite suppliers, and either one will get you coffee at under $6/pound. If you want to try the glazing, put sugar water in a spray bottle and mist the coffee as it roasts.
