Did a fair bit of research into these sort of dumbbells. Quite a few options on the market and different types of adjustable weights, digital, dial turn and ratchets.
I've been using olympic dumbbell bars for a while but when flipping between workouts changing the weights for different exercises done back to back takes too long.
These are great quality, I like that the weight dial adjusts from either side but you only need to turn one dial, unlike some others where both sides need turning to adjust weight.
They have 2.5kg increments which isn't bad considering they range from 5kgs to 32.5kgs. The weights hold solid, I don't worry they will slip off and I've used them for all normal dumbbell exercises without any issue.
The base is solid, does the job although some people have said it feels cheep... its strong plastic, but it's not what you use, it just holds the weights when not in use so seems upto the job for me.
Handle is comfortable, a good thickness and material is nice to hold.
The clicks to change the weight sound quality, they let you know that the lock is engages to the weight. And there is a red safety button which you need to press to adjust the weight. No chance that I can see of accidently changing weight or releasing the weights mid exercise.
Overall I'm really impressed, a great weight range from a small space and quick to change when working out.