I listened to it vs. the BCD-1 when I first got the CD player (which I sold and now have the BDA-1) when it came out. The owner of the shop would hide both units from view (and I also auditioned another player at that time) and put a CD in each with the same track number showing. While audio is a matter of preference and synergy with other components (I auditioned on Thiel 3.7s which I own on both Bryston electronics which I own and also Ayre), I found the sound of the Rega a bit more veiled and more laid back vs. the Bryston. I owned the original Planet when it was out many moons ago and if I like the Rega better I would have had no problem buying it.
Thanks for chiming in Phil

The fact that the Rega uses a class A output stage is what drew my curiosity. I don't know that it's built of discrete transistors like the BDA, but I figured it might have some of the same characteristics just the same.
Even after owning a BAT VK-D5SE and Wadia 381, I think the BDA offers amazing sound quality and respectable bang for the buck. (It also measures quite well

)