They have been a standby for beer league racing for quite a while. A bit stiffer than many cheaters (Atomicman mentioned this somewhere a year or 2 ago).
You have to be careful buying used race skis, especially cheaters; they may have been used past their natural lifespan - school and FIS racers need to dump last years lightly used skis to purchase the new specification ski du jour, or have out grown them, hhowever, so deals on those are more likely, in my experience.
Cheaters tend to be used past their prime since there is no need to change year-to-year for adults, and they make great groomer bombers even after their race-life.