My brother has an account in this bank. So I also have an experience of the services of this bank. I would say that its services are up to mark. Till now we have not faced any issue with any kind of process with HDFC, whether it is any transaction process or any other. If I call to their customer care center, they never failed to respond me immediately.
Once I was near a village and there I got the HDFC bank ATM. It was a great help for me at that time because I needed money and I got the only ATM in that area. I feel that they provide the best service for their customers and I have a very good experience of it.