When mine warped on my Speedmaster, they were replaced under warranty. Yes, it was worth getting them replaced. No, the new ones have not warped (that was four years ago).

For the $202.45 you can get the EBC MD 601 floating rotor from FastEddy http://www.fasteddysports.com/?page_id=3&product_id=172 or for $232.99 you can get EBC Pro-Lite Disc System Complete with EBC HH Sintered Brake Pads from NewSpeedmaster.com http://www.newspeedmaster.com/html/ebc_brakes.html.