Good for helping the back swing, careful during the down swing, you can hurt yourself !
SUMMARY: Great for backswing training because of the weight, but that same weight can injure your wrist during the down and forward swing, use caution.
I own the Momentus iron and driver trainers, and all of them are effective for training the backswing because the extraordinary weight lets your feel the position of the clubhead and your elbow position on the backswing.
When you bring the clubhead down through the entire down and forward swing is when you risk injury, the weight can feel like it is pulling your hand off at the wrist it may not happen immediately but insidiously slowly and you don't realize it until the car ride home.
The Momentus is best used with an impact bag filled with bird seed or sand to help you sculpt your back swing, but it isn't necessary.
Here is a tip that will help you shape your down and forward swing and it won't cost a thing:
1. Use a towel or driver head cover and pinch it inside your armpit before you set up to the ball. If your're using a headcover, use the sock part or the bottom part that fits lowest around the shaft.
2. Execute your swing and make sure the head cover or towel never falls to the ground.
This helps you condition your swing to leverage the swinging forearms and helps to quiet over active shoulders. The next part of this tip, snap your arms through the downswing, feel your arms surge through the swing near the point of ball impact and this helps you square your club head and gives you extra distance.
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