These work great for my purposes but the corner pieces are very sharp! If you have little ones running around, they could pose a danger if were to fall on the corner. 

They are kinda flimsy as well. Not a big deal for me, but you do have to be careful when you are placing them to ensure that they are square in the ground and don't shift around as you fill them.

Very quick and easy to put together, but again, be careful because the unfinished edges are very sharp. We spray painted ours to match the trim on our house. They took the OK. They scratch pretty easily.