Last night Amanda Dean, Amanda Miller, and I got together and fought a few arena battles. We were online and fighting between 10:00 p.m. CST and midnight (timed so I could watch the first showing of Battlestar Galactica, and Amanda D. could watch the second – we write for a computer game website, what do you expect?). The server itself was interesting, and the matches were a blast.
We've been at this before on the Tournament Test Realm server, which was the "beta" version of the Arena Server. There was only one server and everyone could make a character, so it was often crowded and slow. On the Arena Server, you have to register to enter the Arena Tournament, which costs $20. Only then can you get on the Arena Server. This makes things a bit more manageable in terms of population and server stability. There wasn't much lag or other issues.
One thing that I found was the queue times were very fast. We didn't have to wait more than 10 seconds to get in a game. We were playing 3v3 matches, so this might have had something to do with it; as I'm sure the queue times were higher for 5v5 or 2v2.
If you're wondering, and I'm sure you are, our team name is "WoW Insider" on server one, and we're named "insideradam", etc... How many matches did we win?