need mileage reading changed

Hey guys, this is my first time on this message board. My car reads incorrect odometer mileage. I have to have it changed or reset or something. My friend told me that

http://www.mileageman.com

does this stuff cheaper than all the other guys. Does anyone know about them? Have you guys used them before? Please help, I need this fixed asap. Thanks

how is it "incorrect" and isn't rolling it back illegal?:rolleyes: