My bank has a formal promise to cover any online fraud so long as reasonable care was taken. It also pushes Rapport. You can work the rest out for yourself : )
I'm with vimto girl on this. I installed Rapport when my online bank offered it last year because I think 'reasonable care' requires compliance with bank recommendations.
I had no problems installing it and I don't think it makes any difference to performance. Being a technical idiot I don't understand how or if it works; but I'm long enough in the tooth to know that the financial "industry" will dive through the tiniest loophole to avoid payment, be it phantom cash withdrawals from ATM, equally mysterious debits from accounts, or the Great Insurance Scam.
Non-installation of Rapport is just such a loophole. In fairness, I have had excellent service for the six years since I joined my bank.