I use Google Apps for Business because I no longer have to think about the bullshit around mail and spam, and that's not going to change until the alternatives are worth the time they require me to invest. I get the argument regarding Gmail, but if you want somebody to not use Gmail, you're gonna have to be better than Gmail. Nobody is. (Outlook.com is okay, but their web client is garbage and email is one of fairly few things I want as a web app.)