As a name changes from orange to hutch, and from hutch to Vodafone. . the service remains the same as always. Me and my family members using Vodafone service from last 8 years and never had any issues about quality of service. In some area it may have any issues but I have never experienced it till.
While roaming also, It doesnt have any connectivity problems. But I hate the data packs valuation. .they are expensive nowadays. .
Overall the service is best.