I was really excited to test this especially because chopping onion is a massive issue for me. I cry like a baby!
I had very high hopes for this but unfortunately I would rather take a knife and chop it myself.
This chopper is way too small. You can’t really put a whole onion inside so you have to pre-chop it which seems completely missing the point. 
I had to use a lot of force to actually chop it and the onion at the bottom of it still wasn’t chopped. Just feels like unnecessary additional step in the cooking process.
I had to play with this onion more like this than if I was actually chopping it with a knife. 
Is easy to store as is small and also easy to wash but beside that is a gadget and not really a useful tool. Shame as had high hopes for this.