I had sdsl with Covad which is who speakeasy goes through and the speeds depend on how far you are from the C-O and the quality of those wires. I got MAX about 1400 up and down to most closer sites and to further it was about 1200 most of the time. Pings and hops were great and i dont remember ever being down unless the power was out and if something was wrong they moved there asses to fix it within a few hours.
Overall it was amazing service for a high price but it was over $150 a month cheaper than a T-1 at the time for about the same speed and a slightly different SLA. I also had a T-1 from megapath which felt about the same in terms of using it but the only difference i noticed was that the T-1 was about 50 to 100 Kbps faster and it cost a bit more.
I dont know how speakeasy is doing since bestbuy bought them but see if there is a trial period that you can get without paying alot or free if possible.
Here is some tests with my SDSL that i had
http://www.testmy.net/tools/database/db_search.php?type=user&q=Blunted%202&framed=&limit=250&sort=user_host&d=ASC
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