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Negatives: For anyone buying this product, beware that the inside is extremely dangerous for your fish. On the inside the edges and ridges are Razor sharp, and I'm not exaggerating here, I nearly sliced my finger! This is unusable as your fish will cut themselves. I am going to try and sand everything down if possible because there seems to be a shortage of Aquarium supplies most likely due to COVID-19 and Supplies from China. If the manufactures can see this, please please please take some time to smooth out the edges or change your molds some how because its useless as is with the sharp edges. It also has a slight smell of a chemical or glue but this seems to go away as you wash it.
Positives: The outside looks very nice it has a nice weight to it.
It's a pretty good design and size for the value, but please note that the interior edges of the plastic are VERY sharp. If you have delicate fish like bettas, goldfish, or scaleless fish like loaches, their fins may get torn or they may develop sores from darting in and out of the decoration. Would absolutely be fine for shrimp/crayfish though!
Unfortunately this was larger than expected and didn't fit my fish tank, but the overall quality wasn't bad. I did notice some particularly sharp edges around the cave entrances that could cause some damage, but I suspect those could be sanded down.