The bar diameters are so good that when we hold it in our hand feels really good. Even with one round of curls, the biceps feel the pump and I am always eager to push for the next round.
I Have many of these bars, all set at various weights, on my dumbbell rack, they have a nice Chucky handles and the bars are 2kg each. my only problem is that the locking system, does come loose. But once you get use to that, it become second nature, to give it a quick tightening between sets.
Grip is nice. Also lock is very good.