www.golfblogger.com says:

"I used the Duffix for an extended session at the local heated range the other day, and found that it works as advertised. When swinging with the Duffix set at 10 o’clock, the weight forces your hands over, closing the clubface. The reaction was quite noticeable when hitting live balls.

After some weeks of practice with this, I can clearly see how a player with a slice issue could train his hands to snap through. The same might be said of a hook.

If there’s a complaint, it’s that the weight is almost too much, forcing my hands into a quick snap. A future redesign might include some adjustable weights, so that a person could ratchet down the effect. That also would be useful for extended training use. Over a matter of weeks, a player could weaken the force needed until he weaned himself off the device."

A touring PGA Pro says:

"Although I was never one to embrace training devices, believing that the swing is a result of natural feel, the "Duffix" Swing Trainer is the first and only swing training device used on one's own golf club of choice that makes you feel and release properly throughout your swing plane."

David from Georgia says:

"I have to tell you this, then I'll quit bugging you! I swung the trainer for about 15 minutes Friday and went out on the course in the afternoon. I broke 90 for the first time in my life! There is a short par 3 over water. It has been my psychological downfall ever since I started playing this particular course. I put the ball 8" from the pin for a birdie. I put more shots in the fairway than ever before. I simply cannot believe what your swing trainer does. I literally felt I was throwing money away, by paying greens fees to play so poorly. Not any more. Thanks so much for putting a product out there that really works! You need to bite the bullet and get this thing into the PGA Superstores."