Rodman,
The XXX was a demo unit direct from AM (and I concur with Jtwrace that Jerry is a good guy), so it was already broken in. That said, I left it in for a week anyway before critical listening.
Again, ymmv, but in my case, it did not fit.
Believe me, I wanted the XXX to work and it is a nice product but...
BTW, I still have the RGPC1200S and subsequently did a back to back with A BPT 3.5 Signature and the 1200S still won out for transparency and "cleanliness".
I should mention that I live in a suburban/rural town, i.e. I do not have a ton of commercial noise or apartment bldg issues, just the typical power company trash/surges/dropouts.
So, again, YMMV.
HTH