​​Changing up your hair color can come with many refreshing perks. Whether you want to try out highlights or go for all-over color, today's best at-home hair-color kits have stepped their game in terms of formula, color selection, and ease of use. Many formulas have built-in or included conditioners and boost shine — who wouldn't want that? But the time (and cost) of getting a dye job at the salon can add up, especially since maintenance is needed to keep your new hue in tip-top shape.