We've been using tellulcloud to manage our digital signage in schools for 2 years now, it's reliable, scalable, easy-to-use, but most of all very customizable! The support team at the moment can be quite slow sometimes - not sure if they are just busy or what the problem is there. But I'm guessing this has more to do with them than with the product itself. It's a great tool that allows me as an admin to easily control my school's digital signage from anywhere. Not only am I able to see exactly which screens have changed when I walk past them (which saves time), but also everything else about the screen such as image, content etc. As well as being able to add new images/apps or change existing ones without having to ask someone who knows how to use Photoshop.