I moved one of my 55's across (a Shadow DPS) and noticed the lag first flash point I did. Instead of instant casting it takes like 1 second to cast because of the lag.
Also interrupts are almost impossible now. 1 second boss cast, 250ms of lag, 250ms for the server to ack the interrupt, that gives us less than 1/2 a second to get the 1 second cast (which I think is almost impossible even if you have it bound to a mouse button etc).
Think this is my time to stop playing....Its just not fun now