Guess I must be one of the lucky ones - I have my GMail set up directly on my device without going through MfE (for email).

I've had minor issues from time to time with email being delayed (but not just GMail) yet, by and large, it pushes email throughout the day and then backs off once I cross the "off-peak" time fence to every couple of hours.

My primary email account on the device is GMail, and mail gets sent without pain.