I have the freedom to leave this life whenever I want. This is an inalienable right that no one can ever take away from me. The aspect that concerns me the most is the "assisted" side of things. People should not be punished for helping a fully self-aware person to die.
This might sound jaded but I see suicide and euthanasia laws as the State controlling its assets: people. Imagine if people had the empowered impetus to die if they wanted to? The State even tries to control your means of death.
If I really want to die then the State is not going to get a say in whether or not that is going to happen.