I love that it is so easy to use, you can do everything right from your phone! There are no buttons or knobs for me (I'm old school) but there's nothing wrong with them either - they're just as good if not better than some of my other devices in terms of ease-of-use/accessibility features etc.
It does what we need without being too complicated which makes life easier when trying new things out at work. The only thing i dislike about this app would be its price tag compared to similar apps such as Sway & others however their functionality isn't quite up to scratch yet unfortunately. We've been able solve our accessibility problems by using ARCHES software including real time feedback through speech recognition where previously clients could have difficulty understanding instructions given verbally due to hearing loss / vision impairment issues.