Breakin of Marantz SA8260 SACD player

I just took delivery this past Wednesday of the Marantz 8260 player for use in my dedicated 2-channel music system which consists of Maggie 3.5s, ARC LS-3B preamp, Bryston 4B-SST power amp,Grado PH-1 phono preamp and Linn Axis table. How long does it take to break in this player and is there any advantage to leaving it on all the time, so that the DACs stay warmed-up? This player sounds a little louder than the DEnon 2910 I was using. I checked the output specs and found that the Marantz is 2.2v while the Denon is 2v. Should this produce an audible difference in loudness, assuming the preamp is set at the same level?
What's everyone's opinion of this unit? Stereophile rates it Class A, but the review that rating stems from isn't what I'd call a full-fledged review. Thanks.