I am using vodafone for more than one year . On that basis I would recommend this network for all .
In winter vacation I have gone in parts of india, and I noticed one thing that it may happen that its signal way tend to weaken at some location but you will never be in a situation where there is no network.
I would especially recommend it for professionals that can pay more money but dislikes bisturbance between calls .
AND if you have dual sim phone then its a must.