The SA8005 I auditioned slowly improved over several days and settled down after about 60 hours of use. As I recall, on two occasions I ran it continuously overnight in Repeat (All) mode with the rest of my system turned off.
Yes, indeed, the 8005 leans to the warmish side of neutral. That aspect will not change.
If you decide you like the 8005's sonics but won't invest in SACDs after all, I found the Marantz CD6006 sounds the same as the 8005 when playing redbook recordings via the analog outputs (the 8005's transport, though, sounds better than the 6006's transport). I had both players at the same time for comparison. Thus, for CD use only, the 6006 will save you some money. The only physical difference that comes to mind is in the larger text size and additional info shown by the 8005's front-panel display.
Music room: Cary SLI-80 tube integrated amplifier, McIntosh MA6500 integrated amplifier, Quad 99 preamp, Quad 909 power amp, Acoustic Research AR9 loudspeakers, Yamaha CD-N500 CD player, Teac UD-503 DSD DAC, Phase Linear 8000II linear-tracking turntable.
Theater room: Panasonic 65S60 plasma television; Yamaha RX-A2020 (preamp section); Adcom GFA-5503 and GFA-5400 amplifiers; Polk LSi25, LSiC, and LSiF/X loudspeaker system; Velodyne FSR-18 servo-subwoofer.