It seems to do its job. The most basic model should be fine. I got the one with altitude/barometer (why, I don't know). I will see if I can take it to the meet this week and compare it with the real wind gauge. I have never really played with an athletics wind gauge (Gill) so I can't give much critical/comparative info.
This is the one I got. I still have not figured out the exact specifics of the avg. wind speed feature.