MTN is my number one even though their data is getting more expensive by the day.
I borrow airtime with it and it solves emergency most times. Their free data also helps but it doesn't last long.
My experience with their customer support has always been seamless. Last month, my MTN Mifi double data package expired, i called and got a detailed explanation and the customer support guy even advice me to take higher plan that can save me more data.
MTN is great, pls just reduce data price.