In a sentence, Hells yeah!
The National healthcare here is appalling in my humble opinion 
Massive queues, bad doctors, buildings are falling down, they aren't equipped properly. There are literally bats flying around in the operating rooms.
I know someone whos baby died just because they had no oxygen.
Private insurance isn't cheap either, but it's a necessity if you want peace of mind. Private clinics/practices are much better equipped.
For me, my partner and child, we have one of the better options and we pay about N$3000 a month.
Basically, with medical aid (depending what grade you choose) you get a certain nº of visits to a private doctor a year covered. It'll cover most of the medication you get prescribed.
It really depends on what grade you choose, for cover on operations/giving birth etc, at private clinics/hospitals
And there are many private hospitals/clinics you can choose from these days.
Harriet.