The automatic opening works fine. You can also leave the lid open permanently with the button 'open', very useful when peeled potatoes into the garbage, for example.
The battery charge is no problem with the sun, my kitchen is certainly facing south but I live in Paris so no sun at all times.
The 50L garbage bags are very well adapted, they can have a little margin and prevent cracks in the bag when filling out the trash to the edges, as is often my case.
Since then, I also bought the small model in white, 6L and without solar charging, to put in the bathroom and put dirty diapers of my baby.
A buy eyes closed.