What others have said and done:

Louis Simmons of Westside Barbell  tried it out and here's his comment:

"The Free-Spotter is a great innovation for any lifter who trains alone or prefers to go to failure."

Adam Mamola, world class bencher

Bill Gillespie, past NFL strength coach and world champ lifter

Matt Christie,  a very winning powerlifter  

Cory Rideout, competitive powerlifter,  combat arts practitiioner, and long time Free-Spotter user 

Some independent videos by users:


Good operational description



swiss bar Free-Spotter