I thought I would 'bump' this thread. I upgraded my LP12 with a new Radikal D and Kore Subchassis along with the new Cirkus bearing/ springs and grommets.
The improvements in SQ are NOT small. The jump in resolution, freq extension at both ends of the spectrum, inner groove silence and overall ease of presentation is easily heard. I do believe that the current LP12 with Radikal D is still at the forefront of LP reproduction.