I recently picked up Hayes Prime to replace the crappy Avid Elixir ne'er-do-stops some shop put on my rig. They did not come with rotors, which was OK because my existing rotors (which I do not believe were Avids) worked just fine.
On a related note, I don't recall anyone ever mentioning Hayes here and wondered why. Does nobody run/like them? Granted the HFX was a poor attempt at "cost reduction without performance/reliability degradation," but other than those and the Avid I have been running them almost exclusively for almost 20yrs, minimal problems. The Primes were load and lock (load and modulate, really) too.