If you're in JHB, I would recommend giving IS (Afrihost) a try as the prices are far better than MWEB's and JHB users seem to have very few issues with the IS based accounts.
From a CPT perspective, IS (Afrihost, Axxess, Openweb - irrelevant of what special agreement the ISP has made with IS) has proven to be a balls up every time I've given them a chance, MWEB is a lot better for bandwidth quality (from my experience with Afrihost). Peace of mind = MWEB, as apposed to coming on MyBB to check if I'm the only one who's getting super ****ty speeds numerous times per week - with MWEB it's always good.
MWEB and Afrihost have good support when using the MyBB forums - as far as email support goes.. i don't have much to say about either except it's slow and MWEB is probably quite a bit slower than Afrihost with email support - but, the MyBB guys are on the ball (i'd say that MWEB Guy is a bit faster to respond than Afriman - but still, both very quick), and I generally only use MyBB for support requests.