Careful with your safety !!! great idea + poor dev/support = average product
Positive Product Points
The design and idea are very attractive if you like 'making' coffee in a green way.
Negative Product Points
I had an accident with mine because of a faulty part and wasn't happy with the quality and the way the manufacturer dealt with it. Wasted time to something that could be solved with a prompt replacement and a professional reply.
I really didn't expect going that far but once I did I hope it can be of any help for preventing possible accidents.
----------- Fortunately I didn't have any injury but I was startled by the burst and, after examining the way it has broken, with what could have happened to my hands and face. I then re-read the product's manual (front & back) looking for any tip or warning about pressure but the only thing I could find was "use coffee ground for expresso machines" - which can vary from grinder to grinder, not to mention the tamp pressure.
My biggest disappointment however was when examining the broken connection arm. It turned out to be hollow exactly in the corner where it has broken. You don't need to be a mechanical engineer to realise it is one of the parts which suffer the biggest stress in the system.
The vendor was very good and attentive. Would buy other products from their store.