Happy so far
I have just started using Airmail on my iPhone and have been very happy so far. It seems a lot quicker than the standard Mail app and has loads of customisation options. I had a bit of a problem getting the Apple Watch app to work so I contacted 24/7 customer service through the app. The problem was resolved within the hour by the representative (Sarah) - and it was even on a weekend. Will update my review if I have more to add after using Airmail for a while.
Quarksta about
Airmail - Your Mail With You