I use it all the time, it's very convenient. Make transfers, pay credit card, pay people etc. However I make sure I access it from a secure computer (well as secure as I can make a home computer) and make sure no passwords etc are stored on it. I only use my own personal computer or a trusted friend's, never a public one.
I have never had a problem. It was also very convenient as I picked up quickly that someone had cloned my credit card and were giving money to North American cancer charities. Got all money returned quickly.