These shoes were bought for someone who has taught  water aerobics for many years.  They wanted to try a pair of the Jambu shoes.  After several weeks of use she found that after leaving the pool it is difficult to get the water out of the shoe before going to the dressing room as compared to some others she has used.  Also the sole  is not sufficient for rebounding cardio exercises in the pool.  It is too thin and needs more cushioning to come down hard on the floor of a pool.
The shoes are fine for walking in water and would rate more stars for this purpose, but just do not suit the purpose of actively performing water aerobic exercises.