I have used vodafone for more than 2 years and had good experience with their service.
Their call rates are fine and message offers also better than idea service.
I had faced problem in my hometown with network so I thought of changing this after expire period of the sim validity.
Anyway 2g works fine, 3 g I have not used for more days, its quite good and bad both.
Service, customer care all fine, offers are good, I can recommend.