Here is how I see it :
1.) Telkom guest account: works for
*
http://games.saix.net and forum NB Not for SGS games servers though!
*
http://www.telkom.co.za
*
http://www.saix.net/
*
http://userstats.adsl.saix.net/ (Any SAIX ISP users can check here)
*
ftp://rrba-ip-dns-3.saix.net/ (Only slackware is hosted, unknown version)
2.) Local only accounts are good for
* Internet Banking
* This forum, and myadsl.co.za for ADSL,3G etc news
* Gaming on SGS servers all the 196.4.x.x servers
* News servers if on IS (See # below)
* Stuff like
www.bidorbuy.co.za
* Most university sites and FTP's (
http://ftp.up.ac.za/)
* Some other stuff (Greenlab, etc) I don't know much else !
3.) International for everything not in 1 or 2
# Good for downloading all sorts of stuff, so I've heard, I'm in a SAIX account and I've heard SAIX news server is quite bad ! I must still confirm that though
Note: I just keep telkom guest account as a "dial-up" account which you learn how to setup when you get routesentry

In all honesty I only really use it for SGS forums
That's my 2c !