There are a lot of crevices and areas you can not get to. Many of which could lead to disaster if you opened the bin while they were halfway through it...
The plastic is also extremely week and flexible. I don't trust that white plastic to not melt either like I do with thicker tubs. They are also much more difficult to clean and are far from escape proof.
I looked into them in the beginning, but decided it just wasn't worth it.