Pass labs X250.5 vs Jeff Rowland Model 10, or 201

I just bought a Pass X 350.5 . I have 100 hours on it .
I would definitly say it has a very natural midrange. Not harsh in any way. Sort of tube like. Center stage is very deep.
Not sure on how many hours it takes of playing time to reach its full potential though. Any ideas ?

Thanks, Jwon.
Did you hear an improvement in sound from 100-hours to 600 hours ?
At 100 hours I still think the bass needs a little refining.
I am using the Pass Amp with my APL 3910 direct. No Preamp.