Thanks for the input. I am just a recreational skier and thought it would make my boat safer with a product like that. It is an expensive product, so I put together a group buy with the manufacturer to save some money.
I just wasn't sure if it had any application to trick skiing, but you helped me understand why it might not be as effective as what else is already being used. It does have a manual release as well. Maybe not as easy to operate with multiple skiers, as was mentioned, but might work for a single trickster? Then you could have the back up safety, in case the spotter was a little delayed or distracted.
I could post up the GB info., but I didn't want to waist the forums time if it's not relevant.