I was using BSNL DataOne Home 1800 plan with 512kbps speed.
The speed was great compared to old ISP i was using. Never faced any problem with net connection other than few phone related problems. Only problem was the 5 GB monthly bandwidth limit.
On May BSNL introduced 256 kbps unlimited usage plan for Rs. 900/-. I will be downgrading my internet connection to this as there is no bandwidth usage limit.