It's a neat traing aid.
It's fun to use, you can use it almost anywhere, not very expensive, looks cool; and most importantly, it works! In less than three weeks I can feel a gain.
I will tell you this, "I'm forty nine and strong, If Bertholy could effectively swing and work out with a 64 ounce aid at 65 years old he must have had some superior level of strength! I hope it was developed by the use of the aid, not a "Gift from God"; because it was developed, I will get there too

PS
I am now using the lead knee as the trigger for both the backswing and the downswing.
Lead knee kicks in and back to start the backswing and then moves out to the ball to start the downswing.
It's funny I couldn't start the downswing as easily with the lead hip as I can with the lead knee, but the hip moves nontheless as I move the knee???