(I've up-voted you ... our contexts are different, our experiences are different, the results are different, and it's important people get all points of view).

I have/work with three different companies ... two of them use Google based email systems, one (my own) does the filtering "in house". One of the G-based systems performs well, the other has multiple false positives every day.

I'm sure it performs well for the majority of people ... it's likely that the emails I send and receive are atypical, and Google performs badly because they are not "normal".

Everyone has to decide where that trade-off lies. In my context, I simply cannot trust Google, or any other server-side filtering, for important email. As others have said, it simply means the spam folder is a second inbox.

As I say to my clients about so many things: take advice, understand the trade-offs, make a decision, deal with the consequences.