I have just taken the Motorola handset. Here, you get 10 coupons of 324 for a cost of 3500 including the Handset. These coupons are valid for 6 months.
This means you pay 3500 for first six months. This gives a talktime of 200 (each coupon has talktime of 200) * 10 =2000 Rs.
For the next six months, you can go in for 3 coupons of 540 (since the 540 coupon has a vaidity of 60 days)
=> 540*3 =1620 for next six months
This gives a talktime of 375 (each coupon has a talktime of 375) *3=1175
This means you pay a total of 3500+1620= 5120 Rs. and you get the Motoroal handset and a talktime of (2000 + 1175) = 3175 Rs.
This is really cheap!! However I have not checked out the handset, service and network extensively. Will be updating the review after sometime.