NSD Powerball Auto Start Pro Indestruction Powerball - Smoked Black, 280 Hz

Works well. Nothing like the original from 4 decades ago.

This is a great product. fairly easy to strat up and I have been getting good results after only one week.

Helped with my wrist instability/discomfort. Great product.

I spend a large amount of time on computers due to work/leisure, so I frequently suffer from pain and achiness in my hands and wrists; sometimes carpal tunnel, sometimes not. This ball did not help to strengthen my wrist when used daily.. Instead, it just made my wrist more sore and irritated. The unit requires you to wind it up each time you use it, and it's very easy to get clothing and skin pinched in the rapidly rotating inner mechanism. I wish I had not purchased this as it was a waste of my money.

Too much of a learning curve for someone with restrictions in the fingers, hand and wrist due arthritis.

Product received doesn't have the digital counter as shown in the description on Amazon. Thus, the functionality of this product, gets a one star (zero if possible), since it doesn't exist on the item received. That also means that the value for the money spent is negligible since that same value is available from numerous vendors at 1/3 the cost.

This product exerts very little force and pressure!I find it useless!Sending it back to Amazon

Would not light when manually spun. Accompanying instructions were in Asian only. Device scratched on top as if used. I have worked one of these before, so this did not as if I didn't know how to run it