@sktn77a - sorry for a 2 year delay but I think I can describe the LP12 update now that I have been living with it. Short answer is that “it is really great and I love it!”
I had a hum issue where the Bryston BP-2 MM had this scary low frequency hum that would vary in intensity. Turns out that Bryston had provided an umbilical power cable that was designed for their newer 1/3 chassis power supply. I needed the umbilical that was more of a “Y” umbilical that tapped into my Bryston BP-26 preamps power supply umbilical. It hummed for a second when first turned on then became silent.
As for the sound of the turntable it has just made music listening this fun discovery process. With the ability to play audiophile 45 double albums and reissues and remixes of classic albums it is really detailed and also textured in 3 dimensional space that fills my large living room when played back through my full size Thiel CS3.6 speakers. The gain on the Bryston phono stage is like 41 db and I have to turn the volume up more in comparison to my digital sources but the level of quietness is really good so that is not that big of any issue. One of these days I will open up the phono stage top plate and re-set the capacitance for the tonearm cable and Linn Adikt cartridge. I’m not sure what this will do to the SQ but I plan to play around with it to see. The SQ now is super clear top to bottom, the bottom frequencies I’d like to be a tad thicker to anchor the sound more.
Since I got the Karousel bearing, the Green Street Audio sub platter, the Akurate Radical power supply and the Adikt cartridge all simultaneously I cannot speak to which upgrade accounted for which sonic improvement. But I know for a fact that this Linn LP-12 turntable is the most musical and most enjoyable it has ever been.