Dear Michael: I owned the ET and Dennesen linear traking tonearms and I had the opportunity " to play " with the Air Tangent.
I really like this technology but I prefer the pivoted tonearm music presentation: solid and very well balanced, with the linear tonearms ( and least that was my experience ) the frequencies extremes sometimes where softed. Now, there is one characteristics where the linear tonearms really shine: soundstage, I don't know any pivot tonearm that can beat it.
Another reason is that the linear tonearms need to much " room " for set-up and it be dificult to install with other three tonearms in the same TT.
Regards and enjoy the music.
Raul.