I have Besta in every room of my house. It's super versatile and I'm sure it would be fine as a bench. More on reddit.com

Ikea does bench sitting on some displays, I've seen them done with 40cm tall kitchen units and a butcherblock type top. I'd say add some L brackets to the inside, use a solid top and build a proper base (from wood, just don't use the plastic legs) and it will work. More on reddit.com

Just depends on your weight. We had the cheaper chipboard stepped one with no modifications, and I sat on it all the time with my partner (55kg, 65kg). It was fine, and those ones are much weaker than these. Wood ones are definitely the way to go. If you're assembling new from scratch, you could place extra L-shaped brackets between the sides and the lid for strength. You could place big ones at either end, or small ones between each dividing sections. If you'll place it against a wall, you can put cross braces on the back side, too - triangles are always stronger, so a small wood length across each corner to make a triangle will make it strong. Any unfinished pine will be a reasonable colour match. If you want, you can paint, stain or wax at the end to hide any colour difference. Lastly, consider getting the wooden shelves rather than the box trays - they'll reinforce the structure as a whole, where the trays don't. Personally, though, I wouldn't bother doing any of that for smaller adults or kids. If you're heavier, it's an option (but they're not that big, so I may not be comfortable anyway). Trofast generally are pretty sturdy. The wood ones are quite easy to disassemble (just don't glue anything, and use good screwdrivers bits so you don't mess up your screws). I'd be inclined to just put them together and see, and if it doesn't seem study enough, pop the top off and add the brackets, and some cross braces to the back. You'll see it now before it's damaged, because of those dividers that hold the drawers. But it may be fine! Good luck! More on reddit.com

Not everyone uses these- I don't. What it'd be used for is sitting on to get your shoes on/off, and the ones more like a chest are also for storing things. More on reddit.com