Guys i ported to Airtel a month ago.
Now happy with the 3G speed on Airtel.
I get around 6.5 - 7.5 mbps speed.
One let down is not many good plans for calling, and pricey.
Now i am on 3G plan of 148/- which gives 500 MB 3G Data + 500 2G Data valid for 1 month.
My usage currently fits well in this plan.
For navigation you can use Edge mode(2G), for browsing 3G.
The plan before porting was good, within 1 month they removed 27 Re plan.
Which A-A was 20ps, A-O 40 ps.
Now i am in 97/- plan, which is better than all other available plan for calling.