I was also referring to those, I think it depends on the milage of the vehicle and what sort of use it gets, if he does plenty of laning, fording they will wear out quicker, I just think that a quick check while the caliper is off is a relatively easy check to perform and is also preventitive maintenance. Anyway, thats just the way I think, the seals are cheap and you get a shed load of "piece of mind" which can't be bad thing when it comes to brakes.
Later
Pete
Ps. Where abouts in Joburg are you?