I downloaded the client last night and found myself losing connection with the server within minutes of logging in. I have been checking it over the course of today and the period has dropped down to about 20 seconds before I get booted back to the login screen.
I'm away from my PC so I can't verify if its all on my end or if the mac client seems to be at fault.
Even with the client frustrations I'm still happy to see it available for testing. ;)