We looked at trying Paxful but on trustpilot.com they have a large portion (around 18%) of bad reviews so we were nervous.
I'm quite surprised to see you go with Vertex if you did this. Vertex is less famous and not many users use it, which obviously means that there are no reviews about them yet. What a brave decision (I hope?).
It is true that I have to be aware of that I have never seen this forum discussing Vertex exchanges and I have just looked at this thread, but I wonder why the OP wants to try this exchange, there are still many safer exchanges? Don't you think again?