Got upgraded to 1mbps three months back, my SNR dropped to 6.6 and I started having frequent disconnections. It made browsing and downloading awful inspite of doubling the speed. Finally I couldnt take it anymore and asked the CC to downgrade me back again to 8 mbps and SNR leapt back to 21. The only saving grace through the disaster was Airtel's impeccable service, makes paying for inflated plans with pathetic upload speed palatable.