Not every gyroscopic wrist excerciser has an LCD display. It helps you keep track of your progress and also adds to the fun. You can see the RPM you work out at and your historical best for comparison.
Gyroscopic wrist excercisers are often difficult to start up for beginners. A very precise and steady hand motion is needed. NSD Spinner comes with a pull-sting that helps you get the gyroscope spinning, so you don't have to spend time on starting it up(or learning how to do so).
For a regular user, 15,000 RPM is rather hard to reach. World records are a bit above that. This NSD Spinner has a very smooth gyroscopic rotor. You will probably work out at around 10,000 RPM and won't experience any vibration.
Compared to other fitness appliances, a gyroscopic spinner is very fun to use. It feels like a toy/game, which also lets you compete with friends for who gets the highest RPM.
The rubber handle makes sure the grip strengthener does not slip out of your hand. The handle grip is rather flat with no finger nubs - so you can easily switch the grip techniques and change the amount of fingers you use.
Since this grip strengthener is adjustable only up to 88 lbs, then it works as an entry-level pick. More advanced weight-lifters will find themselves doing too many reps even with the maximum resistance.
You can not regulate the resistance on this grip strengthener. This means that if you wish to increase the resistance or have someone else use the grip strengthener, you need to get a new one with higher resistance.