google for "test internet speed" and you will find many websites offering that. You can check: http://www.speedtest.net/
Goto Speedtest.net or DSLReports.com. Both provide accurate results. I am on the Turbo 1299 Plan and it gives me ~700 KbPS during the day time (Advertised 512 KbPS) For night, it is 1 MbPS and I get well over 1.2. Hope this helps. Regards