If you had asked this question 2months ago, l would have said YoAfrica. It was good, delivering beyond the promise they offer. But like Zol, they suffer from increasing the number of users without factoring infrastructure capacity and bandwidth available. This is also the same thing which affected Powertel and made Zol the shinning star.
Im back to Telone adsl because l cannt get fibre things where l am! Its way way improved than the last time l dished them and they hav now a much better customer service.