You may call these cheap and cheerful, but although not being cross drilled and not having slots these discs can keep up in a perfect way on Elises and Exiges which are predomantly being used on the road.
A track day from time to time is not going to be a problem, but if you're making a habit of trackdays, we would recommend to use the UMX, Motorsport or if you're really serious, our AP Rotors.

These plain discs in OE spec are priced per pair and available for Elise S1 and Elise S2.