I like that it has all of my contacts in one place, so i don't have multiple apps open when sending out notifications for different events or campaigns! It's easy enoughtot use but if you are new there is some learning curve involved with getting everything setup correctly - especially after trying other services as well which were more user friendly overall (ease-of implementation). This service does not allow me an option where they can be whitelisted by myself instead relying upon their system doing this automatically once we get our first payout from them; however since its automated at least then nothing should go wrong unless someone else manually adds us into blacklists using another tool/service? We've been able receive push notification via email within minutes rather than hours depending how busy each day was during launch times etc., allowing immediate response time without having users waiting around while hoping something will happen before being notified again later down stream through emails / SMS messages.. Overall satisfied thus far though still.