If you're referring to liquid screen protector, most of the user reviews are positive but there are a few negative ones. I have a particular brand of it myself, but am reluctant to use it because I've never been able to find a description of how to remove it, including in the manufacturer's FAQs. Nor could I find any explanation of why it is applied to the whole phone, nor any mention of what effect it would have on the optical properties of the camera glass. I also don't understand why handling the phone when applying it, as you are bound and indeed instructed to do before setting it aside to dry, has presumably no deleterious effect on the touched areas. Nor is it clear how easy it is to judge when the coating wears off, nor whether a subsequent reapplication coats only the worn parts, or also the unworn parts. In short there is too much uncertainty overall for my liking.
I'll ask the Ambassador team whether they've used it.