I used excitel for 1 year in rohini sec-6 and below is my review.
Internet speed - they are providing 50mbps and unlimited data, speed was amazing, at the price of rs820 they are providing a very high speed.
Connection reliability- I will not suggest excitel to anyone because of their connection problem, excitel run only 12 days in a month which make you frustrated.
Service and support - my internet service provider was K.G ENTERPRISE and he will give you a headache , they ignore customer everytime when I call him, I complained them about my internet but they ignore me and didnot any action.worst service I have ever seen, I totally waste my 820rs by using excitel.