Lazigirl, I believe in the Netherlands, being helped to die when no longer of absolutely clear mind, is based on very strong advanced directives- which make it 100% clear what the person's wishes are when they get to that stage.
In Switzerland, this is not possible.
Pros and cons are hard to clarify. In Switzerland, it means that someone diagnosed with dementia or Alzheimer's and who do not want to live for years with increased loss of dignity, will have to choose to die in the early stages, even though they could otherwise have a year or more of decent quality of life. In the Netherlands, they can enjoy that year or few of decent quality of mind, having put very clear advanced directives in place, in the confident knowledge that when they get to the next stage, and before they lose it altogether, they will be able to get assistance even if they are a bit 'doolally'.