My memory fails me...
Once knew a guy who left Safaricom to start this venture, and he became successful fast. His business was located in UpperHill and he quickly roped in Safaricom, Citibank, and many other major corproates.
But then the downfall began - not sure whether it was because he was travelling a bit, or he was not paying drivers, or he wasn't paying the financing for his cars!!! It happened too fast then nothing!
So it seems you really have to have your eyes on the ball on this one - ever present, ever vigilant, ever patient.