These reviews are from people who don’t know how to properly read. Each complaint is stating that they are not stackable. The listing states that the compact trays aren’t stackable and that the stackable trays cost more in a 4 pack. When you select them it even says stackable or compact, if your expecting stackable trays then make sure your selecting them rather than the default compact trays.Now on to the review, the compact trays work great and release just fine. They aren’t stackable which isn’t an issue for me. They feel like they will last a few months to years of continuous use.The stackable trays stack via alternative sides of the tray. If they are all facing the same way they stack into each other for storage, but if you alternate the stack by rotating every other one they stack just fine with liquid. Unfortunately the stackable trays feel cheep and probably will be very brittle with just a few uses so I can’t recommend them.I bought it when inflation is just started. pretty good product for 2022. Have been using it for three months, with no issue.I did not like the fact that when you stack them on top of another they fall through. You have to criss-cross themI didn't have very high hopes for these from the beginning. The plastic is very thin and I expected them to break pretty quickly. After only 3.5 months, I'm down to one useable tray. The other three cracked and/or broke - the first one within 2 weeks, the second about a month and a half, and the third one yesterday. I've tried running the bottom under warm water to help release the cubes but that doesn't help. Won't purchase again. I don't like the silicone trays because the cubes are too small, and the large silicone trays don't fit in my (apartment sized) freezer very well. I was hoping these would work out. The cube size is great, but the plastic is just too cheap.Ice trays are ice trays right? However, these do not stack together, no matter which way you turn them. You have to put them side by side in the freezer. It's a pain.Easy to get the ice out but when you fill the trays up, you cannot stack them on top of each other in the freezer. they are not SpaceSaver friendly. That’s my only complaint.Reading through the reviews...all you have to do is rotate them in the other direction and they stack perfectly! Rotate them back and they nest for storage. ??the trays broke after a month of use.