Unipivot tone arms

I wonder if the use of a unipivot has anything to do with cost of manufacture and complexity of same, vs the more expensive/complex gimbal. I use a variation on the unipivot design, a Well Tempered ’Black’ arm that sits the pivot via strings in a bed of silicone fluid. I do think that some of the unipivots have fundamental issues, like chattering on the point, or some other instability. The Naim Aro is a good example of this.

"I have ownd a Naim Aro for 25 ears along with a myriad of other arms. It is very stable due in part to the low centre of gravity ( below the pivot point ).

You either had a faulty arm or maybe it was your bouncy castle ( Linn ), though Martin Colloms used the Naim Aro on his Linn for many years and one of his key criteria in choosing the arm was its resistance to the problems of footfalls on his sprung wooden floor."

Actually, I think the Naim Aro is one of the few non-Linn arms that works with the old fruit box. However, since we are discussing Uni-pivot designs, the basic issue with the design is the problem with the dynamic azimuth error as the arm encounters irregularities in the groove. Resulting in ’rolling’ side to side. Not ideal, IMO.