Erm; never had any problems with it and as far as I know all Bank's Servers are very secure indeed. Haven't heard of a successful hack, erm, well ever. It probably has happened.
Worst Security aspect is the loss of passcodes and usernumbers; but you still can't do much on the Bank Servers connected to the www; online check balances really on most. Obviously more expensive banks will allow far more use of transfering abilities but they'd have more security then.
Have you e-mailed any Banks, Barclays, Halifax on the subject?
A Knight is sworn to Honour. His heart knows only Virtue. His blade defends the helpless. His might upholds the Weak. His word speaks only truth. His wrath undoes the Wicked.