Never heard of it but, I'd try it, send me one.

Hey! This sounds pretty cool. Sounds similar to those old grips that were used for arm strength for bowling. This seems better and softer on the grip than those other ones.........

I had one of these. It wore out kind of fast. But it was fun to use until it peetered out. It definitely gives your wrists a heck of a workout.

Would love to buy one. Someone PM me with an address or email!

Used one of these for the first time about a week ago. The viberation makes your wrist feel great.

I am a helicopter crew chief for the Navy and I do Search and Rescue. This is a great product if you want to work on the strength in your arms. We use these to help us get the wrist strength built up for the helicopter rappels and cliff side rescue work.

I have used one of these for about six months now... It has made all the difference in the world to my wrist strength, I also play racquetball and I do not lose very many games. I used to have issues with tendentious, but with the use of this dyna flex i have very little problemsat all.

Wife bought me one of these a few years ago. I thought it was a joke, but found myself using it at my desk while on the phone and, lo and behold it works. Makes a definite difference in grip and overall arm conditioning. Try it, you'll like it!

I NEED ONE OF THOSE RIGHT NOW.

The dyna flex will definitley increase your grip and your forearm strength. I have had this product for over 2 years and it trains your muscles so you it mitigates the chance of you getting carpul tunnell in your wrist or even straining any muscles in your hand/forearm/wrist. It truly is worth every cent.

Fun to play with, but if you don't have the charger station it is kind of annoying to start up with the little string. It is a little difficult to use at first, but fast to pick up.

I WANT ONE!!! LOVE TOYS!!

Sounds neat....but.....NAWWWW

This is freakin unreal. I love it!!! Not only does it relieve my stress but it increased my grip strength.

I love this thing. Once you get it going it is a tremendous hand/wrist/forearm workout. One of the things I like to do is try and switch hands without it slowing down too much or changing direction of the spin in mid-workout. No reason not to have it in your go bag to play with while you are sitting on a static post or watching traffic.

Good for increasing grip strength AND is a great stress relief ball. I have gone through more than a couple of stress ball type grippers and this is the best one and has outlasted the rest.