The flexibility of targeting, very accurate results in terms of engagement rates (compared with other ad platforms). I really like how easy they make optimizing for different goals such as cost per click vs conversion rate etc.. It's definitely not perfect but we've been able build out an effective campaign using this platform without too much hassle compared against others available at launch time when there were many competitors trying similar things - which makes me happy! We haven't found anything yet so far if any downsides have come up from our experience working together since its only just begun recently though i hope thats because my colleagues who work closely within their team know what works best already :) Definitely check them all over again once everything has settled down somewhat more after some initial hiccups/bugs get sorted haha!! As mentioned above- great ease setting campaigns initially especially given lacklustre competition back then around launching new product offerings where advertising was hard due having limited budgets / options otherwise than payperclick through google Ad.