Response from Irene Radjushkina of Actionspace
Hi, thanks a lot for your interest in Actionspace and detailed review.
Wanted to leave a quick comment in case it might help you in any way.
Specially for users who prefer working with tasks on the go, from their tablets and mobile devices, we have a mobile version of Actionspace. Please feel free to have a look at it here: http://actionspace.com/news/actionspace-goes-mobile/
For Mac users we have recently launched a special Actionspace plugin for Mac, it is free, you can download it and find out more here: http://actionspace.com/news/how-to-create-tasks-directly-from-mac-mail/
Hope it helps!