I stay down the road from there head office in umhlanga. Contention ratio I'm not sure.
Had it go down once when they were working on the main line while they were installing it down the rest of the road, sorted within a hour, and another time it was something to do with there back haul provider think it was DFA if I remember correctly so out of there hands, was also sorted quickly. Once or twice in the first few months it might have gone down briefly, but I got hold of them and they sorted it out straightaway. Been stable for months now.
Uhm I don't belive so, there speeds are as advertised. I get 100mbps international up and down, local I have something weird with my router, if I plug the Wan cable into my pc direct i get 1gbps, but through my router I get 400mbps. Must be a settins thing, Not that I'm phased. I am sure if got them to they could help fix it. They Def make the point of getting the speeds they advertise when they install it.
Oh we also use it for work since our office is run from home, so it's vital it is up 24/7