Well it's Sun evening and I've had the player now 3 days running for numerous hours. It's sounding better by the minute!! Bass is tight but yet has punch which I like (I'm a bass player). Sound-stage is pronunced and in your face. The highest of frequencies seemed at first a bit veiled but now they're oh so present!!
Compared to the RCD-1072, difficult to say since I don't have it here any longer but I'd say the 1520 is more airy and distinct between instruments. Perhaps more crisp. The 1072 does that well but the new model seems to perform better in this area. Perhaps more details produced as well but then again, it's to be expected from a new model with the latest DACs vs one designed some years ago. I did love my 1072.
Also at first it took the machine longer to initially read and register a new disc but now it seems to be completing that task much quicker. I absolutely love the front disc load mechanism vs a drawer. The loading mechanism is super gentle and tight. If I had one criticism, the remote control does not work as well as the 1072 did. Not as responsive as the 1072. Could be the sensor on the machine's front. The machine itself is one solid piece of hardware, sustantial, heavy with excellent fit and finish. Mine is the silver finish and looks great against all of the other oomponents which are black.