HSBC stopped a dodgy looking transaction coming out of my account, got a phone call while still in the estate agents who'd just put through the payment, verified it on the phone, and 30 secs later payment was accepted. Wasn't too painful to be honest.
Not quite what he is on about. That's more of the fraud department of the bank being proactive. Verified By Visa is an electronic means of verifying that you are the card holder, you have to sign up to it with personal details that allow you to create an account, when you shop at somewhere that uses VBV it then provides more of a 2 factor authentication, firstly that you have all the card details (name/date/card number'security number etc) you would usually put in, then it pops up another screen asking for your VBV username & Password, get it wrong and it won't allow the transaction to go through (so i believe, never had one fail)
Got to say i've used VBV online for about 2 years now on a number of sites, never had a problem with it.