I like that you can create different ad products for each niche or category of business in general so they are easy to manage if needed but also very customizable as well which makes it easier when needing multiple options at once.
There aren't many downsides about this tool other than maybe having to do some research into what will work best with their site/solution. But honestly there isn't much else because everything seems pretty simple! If anything we've used digitaloye's helpdesk feature quite often too since it works great alongside our website development team (Wix) who helps us set up new sites every week. We use them primarily for SEO optimization purposes - getting more traffic from organic search results vs paid ones through Adwords campaigns.