I bought the offer that included a basketball hoop for the sea, volleyball for the sea, and water polo. 58€ including shipping for everything.

The positives:
The basketball hoop is of average quality, made of plastic (plastic net), but durable.
It includes a ball for basketball, water polo, and volleyball.
They inflate in 3 minutes with your mouth, no need for a pump.
They are great for the pool.
The negatives:
They don't work at all in waves. So the sea must be relatively calm.

The kids and their cousins played with them a lot. Ages 8-13, even outside of the sea.
I added weights to them (made with string and water bottles, I put one on each side)
and they worked much better in the sea.