[Ginguin]

Have you checked efficiency of yours against something like MessagEase (my current keyboard of choice)? http://www.exideas.com/ME/index.php

This is my daily driver and, while the learning curve was rough, it has increased my speed and accuracy considerably. It makes coding and writing longer pieces on my phone a much simpler task.

[coreywstone]

Hi Ginguin - thanks for the comment. I haven't checked compared them, but you're right - MessageEase and HERO were definitely designed with the same principles in mind. I didn't know they had an Apple watch app - I've considered that for HERO.