Back in the day I upgraded my LP12 Lingo 2 first, Cirkus bearing second.
My dealer suggested that was the better order if you wanted to hear an improvement at each step.
And yes the Lingo 2 gave a very audible improvement over the Valhalla PS even without the Circus bearing.
I'd actually ordered a Lingo 1 but Linn delivered the then just launched 2 for the same price - in those days they took care of the dealer network even if the dealer did not stock the whole range.
I found the bits that came out when the Cirkus went in, in the garage the other day, must take them to the recycle one day