The StairMaster TwistLock are a quite expensive pair of dumbbells with a very good grip and easy weight adjustment.
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Pro Changing the weight is extremely easy
To change the weight you just have to twist the handle. The weight that is currently selected is displayed in two small windows on either side of the dumbbell.
Pro They're very convenient to hold
The dumbbell has a rubber handle that has a very good grip even if your hands are sweaty from the workout.
Con The price is very high
$500 for a pair of dumbbells is quite expensive. There are some good options in the same weight range available for less than $300.
Con The weight range is narrow
These dumbbells neither go very low nor very high in terms of weight. They won't work too well for people who are only getting started or those who are already very fit.
Con Only sold in pair
You can't get just one dumbbell, which would be cheaper.
Con They're not very durable
Some parts of the dumbbells is made out of plastic that would likely crack if you drop them on the floor.