I too am a YoAfrica subscriber at home and office, having previously used alternatives they are the one we stuck with a couple of years ago and I have to say I have no complaints with the service, especially at home.
I pay $80 (now $90 I guess) for Wimax unlimited 1mg, and regularly download in excess of 100 gig a month, I stream live sports online and play a lot of multiplayer games and have to say am very happy with the service for the amount I pay.
Would I like the price to go down, of course and to be fair I have some friends who have had very poor service from YoAfrica, but this is normally due to ADSL line problems rather than the actual ISP.
Its tough for me to compare to other ISPs as I last used ZOL or Telone 2 years ago and I have never tried Utande because there is no way I can download and stream over 100 gig for $90 on there.