I recommend it to everyone! Today I rented two jet skis with the guys at Jet Ski Puerto Banús, and the experience was amazing. The guys are very friendly and helpful at all times. I recommend booking because luckily they're very busy. There are a variety of jet skis and options in terms of time, etc.
It's located right in the port of Puerto Banus, so you don't have to travel far to do the activity.