I've had them, just make sure you pick a smart one with a good personality, and you have a high tolerance for high-pitched noise because they don't sing well but that doesn't stop them from doing it for hours at a time.
U.S. instant coffee is markedly inferior to freeze dried elsewhere. Try Nescafe Classico from the Latin section of a large grocery. Its not great, but its way better than the truly vile swill marketed by U.S. Nescafe. Recommended for hiking.