It depends - if you want to activate it without talking to it then it's fine (and I don't find the voice activation useful myself, so am more likely to use this). The ability to use it to silence a call may be handy. But I would rather be able to assign it to whatever I want, which probably wouldn't be Assistant (which I've had enabled for a week to give it a shot, but suspect I'll disable soon as I don't myself find it very useful).