There are more topics to cover than just encryption. Less on encryption, more on other topics.

Is it p2p or server model? I happen to lookup and it seems to be server as intermediary.

Is server side open sourced? Who is running servers? How does client choose the server to connect to? if hop server is tracking data, what will it see?

With all that end address obfuscation, how user friendly is establishing a connection with a friend?