I was testing from a 1gig Qwest fiber connection in a data center in Utah, and only got 17mbit/sec downloads off testmy.net
The Qwest fiber link I was using to test with only 200mbit/sec usage at the time, and Qwest was deffinatly not over subsribed.
I was mostly venting by posting in this forum, I have had customers complain about why they dont get good speeds to testmy.net.
I looked at the leader board and saw very few people with speeds over 100mbit. Also testmy.net didnt list the traceroute with the speed tests of the leaders, or the IP address of the person doing the tests wich would be helpful.
http speed test sites are quick, and nearly usless.
iperf works the best if you have servers on both ends of the connections you are testing.