There's been a lot of confusion between IS and SAIX ADSL accounts, etc. Hopefully this will help clarify (admins, perhaps this thread will be worth sticky)
There are ONLY two wholesale providers of ADSL, namely IS and SAIX (UUNET hasn't got anything just yet so we'll ignore them). All ISPs are reselling bandwidth from one of these two providers.
1. IS account advantages:
- Once you hit your cap, you still get full speed local bandwidth, up to a combined total of 30gb (per month). International is cut off.
- Local bandwidth is generally quicker than SAIX, as IS have 80% of the content on their network. There is congestion between IS and SAIX at the moment, and the link between them is saturated. Being on IS' network puts you on the right side of the link. Peering between IS and UUNET is excellent.
2. IS account disadvantages:
- IS's international ADSL bandwidth goes via satellite. Therefore their latency is higher than SAIX's.
3. SAIX account advantages
- Lower international latency
4. SAIX account disadvantages (from 1st November)
- Hardcapping. After you hit your cap, all traffic will stop.
- Wrong side of the peering link. Access to IS' content (70% of total) is slower.
- SAIX is owned by Telkom