Paul,
I never thought I needed them until I tried refueling my Tiger (full swivel nose wheel) in a 25 kt. wind at Fox field, CA.
Whichever end of the plane you grab, the other end moves a way you don't want it to go....
If you ever intend going to windy locations, put one in... you won't be able to get out fast enough to put in the chocks in a really strong wind....
gil in Tucson