Thanks, Bob.
I spent a half-hour at their site, and I know more than I did, but.....
I came away convinced that the traffic is safe, confident that the authentication will be done with the 1024 bit key, Not sure if the key will be involved in encrypting the traffic.
I had the feeling that most of the assurances were about how OpenVPN would not compromise the servers. That may be because the traffic is essentially invulnerable and I just don't know enough to appreciate it.