Alright, yesterday my Billion 8800NXL arrived and so far I am VERY VERY happy with it! I think I am one of the first to get this router in SA since Tarsus got their stock on Friday and still had to check it into their warehouse and yesterday morning mine arrived ^^
Initial impression and how it works, I am happy

They seem quite chuffed that it is ICASA approved as when you login the top Billion banner has "ICASA approved" pretty darn big.
Telkom screwed up though and put me on a 40Mbit speed profile while I upgraded to a 20Mbit profile so I could not verify my line and do much testing - other than the Telkom Guest account - DAMN 40Mbit is fast! 5Mbyte/s
Got my line and all sorted out, able to remote into my home PC but am at work still so yeah. I will keep using it and see whether I have any issues - although as things stand at the moment I would recommend it.
Will do some more testing tonight with the WiFi signal.
Otherwise it sync's at a reasonable speed and allows you to adjust your SNR for better speed / stability as well as provides a good stats. Easy to use and has some pretty awesome features as well as some more advanced one.
If you guys have any questions or want to know anything - let me know