As a customer it may be good but as a sender it's terrible. I'm sending thousand of email per day, never got a single issue except Microsoft domain that relies on the crappy Symantec spam detector. Once in a while our IP get listed there (probably because a spammer is in the same block as me).
When you contact M$, they are clueless, after day they said it's Symantec. Symantec is clueless about why we get there. They can't point out a single spam email. They remove our ip. Then we get listed again a couple week later. Rince and repeat.