I have been using ABC Broadband for the last few years both at home and at my office and I must vouch for the service reliability and the technology in vogue. I have 3 ABC Broadband connections in use. I have tried tata, reliance BNSL before ABC Broadband and I think ABC Broadband takes the honor of being the best in the business followed by BNSL in overall customer satisfaction. The worst has to be reliance both in terms of customer service as well as connectivity.
I recommend ABC Broadband to all people seeking a good ISP.