They stack well to save space, and make a decent amount of ice at a time. The tops are hard plastic, but the bottoms are a very soft silicone. My only complaint is that they cubes aren't large enough.

Six trays make enough ice to fill about half of my standard size ice bucket in my freezer. Don't aggressively bend, twist, or smash the tray on the counter like you might a more traditional tray. Our freezer can’t keep up with making ice for us & ...  Read More

Let them sit at room temp for a few minutes before popping out the cubes. Makes for easy cube removal. I let them sit for about a minute, then push on the silicone side to remove.

Also left on counter 5 minutes to start to melt to dump into ice bin. When making iced tea it takes all 6 trays to fill the pitcher.

These are the most difficult ice cube trays i have ever encountered. The tray's upper part is regular plastic. The trays are not very durable and we have 2 that have already broke.