I've used both the smaller and larger trixie corner shelves and find them quite sturdy. They've been washed a fair bit, spray plastikoted on base. Have held freesanding wheels and ceramic hides.
I currently use filled with coconut husk.
I've also made my own by getting regular wooden shelves, plastikote and drilling hole in to wind the metal rne and wing nuts.
In my experience, hams maybe nibble the odd edge then leave alone, some of my shelves are over 10yr old!
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