They say you get what you pay for, and in the case of this bed, they're spot on.
The design is nice, the build quality's ok but this bed has been constructed using the thinnest/smallest possible sections, meaning it's rather weak and fragile.
It won't stand any abuse (e.g. sitting on the footboard, children bouncing etc.). Also I wouldn't recommend it for a particularly heavy person.
I must stress that it's perfectly fine as long as it's not mistreated, and I think the price/quality balance is good.
If you need a bed that's sturdy though, you'll need to spend a bit more money.