It's true the higher up the dollar ladder you go with a Well Tempered Turntable the nicer they get. Still, I would challenge anybody to actually tell the difference in models, including your Signature, under normal listening conditions and volumes. As a huge fan of the product I envy your find. Very nice indeed.
Bill Firebaugh once assembled a table out of junk materials at a trade show. He used a golf ball for the arm paddle. I'm told he felt it was a better shape and texture than the original flat paddle.
The carbon Well Tempered arms were sand filled which made them slightly heavier than the metal arms. There are various arm tower designs which in the end do the job.
IMO the most significant upgrades were the black platter, large reference clamp, and the replacement for the original square motor. The Reference arm was simply easier to adjust.
Mr. Firebaugh proved that a Well Tempered even made of junk will better many mechanical tables costing much more.
