I have vodafone 3g in mumbai. It sucks to be honest. Worst 3g ive experienced. Maximum i get is around 1mbps whereas i used to get 8-9 mpbs on reliance 3g. Only good thing about Vodafone 3g is good coverage and no call drops.
I am one of those members then. Let me be absolutely clear that I don't use 3G/H+ that much as my office and home both have UL WiFi, I only need to use data when I am travelling. I mean I recharge with 251 rupees every month all right but at the end of the month I see that I haven't used even half data.
I have got 10+ mbps speeds on several occasions, the max I saw was 13 mbps, I think I have few screenshots posted in the Post your speedtest results topic too. I have never seen it going below 2 mbps, never.
It will always depend on your location though, and I live in a small town.
PS: There's quite significant throttling though, I mean if you use a lot of data in a session at 6-7 mbps, then in next session there will be throttling, you won't get more than 2-3 mbps.