I'm not sure if the server migration will increase the download speeds or not. I haven't tried to download anything yet since they switched.
I get speeds up to 8 megabytes per second from Steam, and other games, say Star Trek online, hover around 3 to 4 megs per second. It'd be nice to see speeds like that, but the AH2 game file is fairly small IMO for what it does, and speeds under 1m/sec aren't really a big deal for me.
edit- Just tried d/l'ing the hi res tex pack as a test, consistent 525kps, which is fast enough for the file size IMO. If AH2 with the res was a 4 or 5 gig size file like many bloated games, ya maybe complaining about sub 1m/sec speeds I could see, but as it stands, IMO it's just fine.