Dennis,
A number of members have reported warped discs but the majority of us haven't had a problem. 48,000 kms on mine with no issues. Getting a little thin though.
Did you bring the bike to the dealer because you had a brake problem or just to replace the pads. If the brakes applied right away and you didn't feel any brake pulse in the handle, I'd change the pads myself and forget them. Takes less than an hour.
