No matter where you are in the country, its same story with wimax.
It will work great if it works fine within 1st month of installation. Otherwise it wont.
The problem with Wimax is the signal strength and the problems with the base stations. And both TATA and Reliance face same issues.
Now reliance does not charge your for the initial month. SO you basically get free usage until the end of the month of installation.
If you dont like it, you can cancel the connection.
And they wont deposit the Rs.500 installation cheque before the installation is done at your place. If they cant get the signal, they will give your cheque back.
So if you find reliance providing service in your area, you can always try it out.