Better than nothing but I had to wear them WITH my swim gloves to get the workout I need.  A model with knuckle blades for added resistance would be a welcome option.

I cannot begin to tell you how useful these things are.  OK, I'll try.  No matter how you move the resistance is there.  The more force you exert, the more it resists.  And you can't get hurt!  Soon as you stop, it stops resisting.  I practice my punching moves in ways that are not possible out of the water.  All aspects of your motion are challenged.  Make your own moves.  You'll get better at whatever it is you want to get better at.  The price is very reasonable.