Have you tried the app? I've moved my top-5 chats from WhatsApp just because of speed! The messages are sent really fast. But if you know any other messenger apps for iOS, which are just about so fast, I'll definitely give them a try.

Anyway yep, these marketing stuff is a bit too dubious, but what should they write?

* is rather fast, faster than some applications

* can self-destruct, but sometimes can not (Ha!)

* etc

That's not the thing that happens in real world nowadays.