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I hate those things!!
For practice and dry land training they can't hurt, I have been using one for part of my knee rehab, one leg/foot at a time and work on 30-45 secs. of balance on each leg.
The one I am used to using is different than the one you referenced in that the 'board' is circular and the balance point is a 'half-ball'. You can use it one leg or two legs at a time. The object of course is to keep the edges of the board from touching the ground. For rehab the objective is to help strengthen some of the ancillary muscles used to stabilize the lower joints (knee/ankle).
Another device you may want to consider is a slide board (especially for your goalie son). It is a great device for working on weight balance and transfer in a shuffle/sliding motion. You may want to check out this url:
http://www.mrassist.com/ . These things are really easy to make (just use the picture as a template) and they have some pretty good training tips at the above mentioned web site.
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