BS? Hardly, in a Cobra it is indeed a valid concern. I myself have seen a couple of replicas with live axles that had a serious travel issue(s). My Excalibur was one, I never could get it right, the ride was very harsh as a result of the limited travel. It was actually pretty good on the track, really bad on the street. That was the primary reason I went with IRS after I sold the car. The new owner has commented to me several times about the harsh ride of the old Excal. I've spent some time working on an FFR with similiar problems. A few inches of travel works fine for a RACE CAR.