I assume you mean
kb/s and not
Kb/s

(or is that from the office network?)
FWIW here are my speed tests. Looks good compared to some of the results poster earlier.
1- VC Speedtest:
http://speed.vodacom.co.za (VC portion) D: 994kb/s U: 342kb/s
2- SpeedTest to Cpt on
http://speedtest.net (local SAIX) D: 694kb/s U: 354kb/s
3- SpeedTest to Ne York on
http://speedtest.net (international SAIX) D: 518kb/s U: 339kb/s
4- SpeedTest to London on
http://speedtest.net (international SAIX) D: 538kb/s U: 301kb/s
What I have discovered is that using firefox the upload test on both vodacom (inconsistent) and speedtest (more often than not) gets to 100% but the test carries on (i.e. the upload speed fluctuates) and then I end up with a really bad upload score.