first the positives:
+ There are 4 equal roles included (when using the device alone, it has the same sufficient spare)
+ The device has a good performance, it runs at a comfortable pace
+ No risk of injury
+ The roller fits comfortably in your hand
+ The volume is absolutely fine
+ After using a really good skin feeling :)
the negative:
- Quite small "role opening" (as there is no "free" role, the device is not freely pivotable)
- It is not a case or bag for storage
All in all a really good buy, the cornea is removed cleanly and without much effort