The seniors that couldn't hear it would benefit from the wrist firm. I have both the wrist firm and the tac-tic (just got both recently), and the wrist firm does a good job of "making" your left wrist stay flat. The wrist firm doesn't effect your grip...which is nice, but if you set up at adjusted address with a slight bend in the left wrist, this is a little more difficult with the wrist firm.
The wrist firm is great at keeping your wrist flat throughout the whole stroke...and you can do full swings with a driver all the way to short chips with it. Someone else said that they would train with the wrist firm first, then use the tac-tic, and finally use nothing during a driving range session...I think this sounds like a good idea.
Unlike the tac-tic, there is no cheating and you either hit a good shot or a really bad shot (nothing in between with the wrist firm). The only downside with the wrist firm is that it is priced about twice as much as the tac-tic ($50-$60), but I think its a good investment.
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