cost/reliability of usb plug 2 surf

Hi,I am visiting Delhi for 3 weeks shortly. Can anyone recommend a usb dongle giving mobile broadband from my laptop. It's mainly for accessing work emails on the move. I would need a prepaid option and not a contract deal. Is the plug2surg something that will work for me. How reliable is the connection.Thanks

1) Home page for plug2surf :
http://www.tataindicom.com/t-personal-internet-plug2surf.aspx

2)Visit this link for TATA plug2surf (data card) internet service's details :
http://www.tataindicom.com/t-personal-internet-plug2surf-tariff.aspx