Never had HO's, but have CAM, had SAM, RS5, 7, 4.5 Hemp, and both versions of the Hoyt-Bedford. They all sounded pretty good even after a few hours. The 4.5 Hemp was probably the most notorious for long break in.
There are quite a few variables as far as break in time with any speaker and no doubt everyone will have a different experience. Type of music played, volume, damping factor of the amp, and room temperature all play a role. Music with a reasonable amount of bass and percussion played at a medium volume is the best way to break in any Omega. Forget the FM white noise break in - you'll be there forever waiting for your speakers to loosen up.