Like I mentioned earlier, how much suspension travel is a big key to how good or bad a panhard can be. In the MGB I put one on, I cannot get a finger between the tire and fender. Without a panhard minor movement in the suspension with side loads would make contact with the fender.
The movement with the panhard rod from arcing is so minimal it has not only made zero contact with about a 1/4" clearance and has in fact kept it located and kept it from contacting.
Binding is ZERO issue with this car. It is common on these sorts of cars and makes it a blast on curvy roads. It has allowed me to autocross without screwing up the fenders.
BUT....I still say success is largely dependent on suspension travel. More suspension travel = more arcing. Admittedly suspension travel on an MGB is less then on many other cars.