* I don't taste 'rubber' from these. * I do think the other points are fairly valid.
However, I still think these are really cool. Granted, they are not firm (no silicon is) so you have to hold them carefully after filling and put them on a flat surface in the freezer. Granted, silicon is not a slippery surface, so you can't push-slide them anywhere. Granted, they hold the cubes pretty well, so I twist it a couple times then tend to use my finger to push up on the bottom of the cubes I want to come out.
But on the other hand, * They fit more ice cubes into a smaller space in my freezer. * They are a better shape IMO. * Unlike normal trays, they don't dump a dozen ice cubes everywhere when I just want a few out for a drink. I can push out what I want and put the tray back. So I consider this 'a feature not a bug'.
Now, if you have a need to very quickly use many trays of ice, so you need to be able to grab something, twist, get a shower of cubes, and move on, then this is NOT the ice cube tray for you.
But if you often use only some of the tray, and if freezer space is a premium, and if your fingers to push up on the bottom of a cube or pull it out are not crippled, then I think this is a great ice cube tray.
I gave it 4 instead of 5 stars because some of the points people made are valid. It's simply that some of them are not any problem with the product, they are merely a factor of what the product inherently is, e.g., that it is not firm, that it will not 'slide', that all the cubes don't just fall out with a twist -- these are issues of silicon (or the literal cube shape rather than slightly slanted sides), which means it's a 'given' for the product, not a fault, just personal preference about this "kind" of product/feature.
If you want the cube shape, you get the "they don't all fall out at once". If you want the silicon, you get the "doesn't slide" and "isn't rigid". If you don't want those features, well don't buy this ice cube tray, and you'd have no complaints. I actually wanted them, so I think it's a good product.