For as long as their network remains poor. It is just a way of attracting more customers to the network but unfortunately, they are unable to keep up with quality of service. 3 months later no 4G in our area.
If you go to their wall, I noticed people of Kisumu, Nakuru, and Eldoret complaining of the same. I have a friend in Nyeri who also told me that they have 4G in the town and once you start to move away from the town to residential areas, the network is barely available even on Edge.