gaddman:
Adding to what hio77 said, here's an example of the different content sources in one test:
Download test for application 232370 [Half-Life 2: Deathmatch Dedicated Server] (also see https://steamdb.info/app/232370/)
Removed existing copy
22 download sources from http://valve2000.steamcontent.com/serverlist/22/20/
Adding download source: steampipe.akamaized.net
Adding download source: steampipe.akamaized.net
Adding download source: level3.cdn.steampipe.steamcontent.com
Adding download source: level3.cdn.steampipe.steamcontent.com
Adding download source: edgecast.cdn.steampipe.steamcontent.com
Completed download of 708 MB in 33 seconds at 171 Mbps (21.5 MB/s), from 11:38:51 to 11:39:24
OT, but Don't think I've seen that script out there... mind linking? I'm interested...