It feels a bit too fragile for the cost.
Also, while items usually ship with way too many papers to explain everything in all languages, I only had a tiny manual partly explaining the fixation part. I had no particular trouble mounting it, but for someone that isn't used to DIY and similar I think it's pretty complicated.
Finally, everything is in plastic, and the "manual" says that having two pairs (= 4) of fixation is recommended for heavy loads (I guess that grocery shop might be considered as "heavy"), but why only ship two then? As it's just two small pieces of plastic and a screw?
Otherwise it's pretty useful and clearly was the missing thing on my bag to carry multiple items, while still having my bag simultaneously.