It appears they are referring to two front 298 mm dia. front rotors and a single smaller diameter rear rotor, so 3 rotors for the entire bike, $200. Not a bad price. They appear similar to other Chinese-sourced rotors guys have been buying for years. I don't recall hearing of issues with the rotors themselves. People report issues attempting to remove the 'button-head' bolts for the wheels. Because of the thread-locker, remove the valve stem from the tire valve (schrader valve) before using heat to soften the thread-locker, and then attempting to remove the button-head allen screws. If the allen head strips-out, use a cold chisel and heat [remove the valve stem from the tire valve (schrader valve) before using heat ] to loosen the button-head machine screws securing the brake discs to the wheel hub.
1985-1992 wheels in front use smaller front brake discs, I think the measurement is 282 mm.