Ive been using aircel from the last 4 years and the experience has been good. Though I am sad to see such a big change in their tariff rates. I remember when I opted for aircel I opted because it free unlimited aircel to aircel calling for 1 year after a recharge of 96rs and now after recharge of rupees 99 you get 6 hours of free calling for 2 months.
Their calling and sms and data pack rates have been increased considerably. I feel their network range is good. Despite the hike in tariffs, Aircel is still cheaper than others.