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

The positives:
- The plastic is of good quality.
- They come with a ball (basketball, water polo, volleyball).
- They inflate in 3 minutes with your mouth, no need for a pump.
- They work very well in the pool.

The negatives:
- The volleyball needs to be tied properly with the ropes to avoid it being crooked (slightly).
- They don't work at all in waves. So the sea needs to 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.