I was expecting these to be poorly made, but it was quite the opposite. Refilling them is incredibly simple, just submerge them in a bucket of water. Getting hit with them is no more painful than any other regular water balloon. They are durable and survived a few blows to concrete. My only complaint is that I wish they were more affordable.I bought three 4-packs (12 total) and they all are good quality. The magnets snap together easily, and the material (silicon?) is smooth and consistent, with a wave pattern. We have had them for a month and use them in the pool almost everyday - they are great toys! Super fun to fidget with and toss around, and they have provided lots of entertainment for kids and adults. I always leave them open after we are done so they can dry out, otherwise I suspect they would get moldy. I was so excited about them I showed our pool installers, and they love them!I bought these for my son's 3rd birthday and they are perfect! He could fill them easy and the magnet in them clamps super easy. I will have to buy another pack for next summer!!The kids can fill there own water balloons over and over,what’s not to like!Water balloons with none of the clean up, These are awesome! Works really well if you fill them up in a bowl of water.Easy to use! Even my three year old granddaughter could do it. They close magnetically. Easy to find in the grass and you can use them over and over.