Haroon - I have seen and heard the Clearaudio years ago, but not in my own room.
I have observed that Tangential tonearms are all very different from one another in the way they were designed, are made, how they are setup, and how they work in real life (their requirements). One can’t just say, I want to try a linear tracker and pick any one. As they are very different from one another, they need to be analyzed prior to laying down your money.
For this tonearm from the manufacturers website.
In a conventional pivoted tonearm, the arm is ’dragged’ across the record’s surface by the stylus following the record groove. A similar motion occurs in Clearaudio’s tangential tonearms, but the arm moves tangentially, with the stylus propelling the tonearm along a linear bearing which comprises a carriage running on precision rollers along a meticulously polished glass rail.
This is very different than an air bearing. There is more friction involved and its performance will depend on the groove conditions and the moving parts of the tonearm. If I was looking into buying it I would want to know about the parts that are moving, how easily do they get dirty, breakdowns over time, etc... . and go listen to it and compare familiar records with a pivot arm.
Some interesting comments here on the Steve Hoffman forum. http://forums.stevehoffman.tv/threads/clearaudio-tt2-and-tt3-tonearms-whats-the-difference.254798/
It appears that other than the very basic design, how the arm actually works has very little in common with its predecessor Souther.
Hope this helps.