I only use the adsl line not voice. 4mbps and it works just fine. Recently handed my billing over to mweb to pay for the adsl side and have no problems. Use High speed wireless from time to time. locally adsl line is faster but not to an overseas connection/site. Telkom services has improved in some areas over the eyars but is still crappy when you have a problem.
Used to only use the DSL line when in a digs.
Now im in my own place I use both, but the voice very little. I rather use the free cellphone minutes I have