I'm still having trouble with the US server sometimes losing its connection, or taking up to a couple of minutes to accept shares, resulting in all stale shares, the EU pool is unusable because it's behaving in the same way but worse.  I also assume that it's not my computers or internet connection causing it because my brother is having the same trouble.  The server stays connected but stops working properly, meaning that I have to disconnect and then reconnect, something that I can only do if I'm at the computer and notice it.