Power zooms anyone use them?

[Pentxuser]

I was shooting my daughter's figure skating tonight and toying with the PZ's 
power zoom clips. I was thinking that it would be extremely useful for a 
sports photographer and thought I would explore them further. A lot of 
photographers and critics don't see a use for this feature but I'd bet that 
if you learned to use it prperly, that it would be very useful given the 
right circumstances...
Opinions...
Vic