The integration is easy (just one line of code) once set up; it works great! It's very fast for us as well - no waiting around until we get an answer from their staff or something like that which can sometimes take hours if they're busy at all in general over there :).
Nothing really I dislike about this service so far either other than maybe how expensive some things are such as SMS credits etc., however those aren't too much more compared to what else our current provider charges anyways plus its still cheaper overall anyway ;) As mentioned above though these services do cost money unfortunately :( But everything seems pretty good otherwise :) If anyone was thinking twice before signing-up because costs might be high then don’t worry since most providers offer bulk discounts after purchasing certain amounts per month/year usually depending upon usage rate / volume sent through them ;), especially when using.