Interesting.
I have a synchronized Doug Nash (Richmond five speed) with a modified Hurst Competition Plus shifter on it, and while the throws are a little long due to the length of the shifter arm, it shifts very well. I have had no problems at all with it in 9K miles including a lot of autocross driving early on.
Other Cobra owners I have had in the car have commented on how fast and easy it shifts compared to their own cars (mostly top loaders).
Speed shifting that car while autocrossing was easy enough and made for great times
until the Jag axle gave it all up. I go a little easier on it now.
I am thinking the shift linkage might have as much to do with these experiences as anything.