The paddles I used before were larger and had many holes. After my first use of these paddles, I was done after only 500 m of uses and I was sore the next day. I attribute the tougher swim to the lack of wholes these paddles have.
Only thing I didn't like about the paddles was the mold left harsh edges just below the palm at the wrist and I had cuts on both my wrist after the second use. I sanded down the edges and since haven't had any problems.