This is awesome, and the best one I've tried so far.
I have Newoldstamp but this one works perfectly.

- Support is always there to help you
- The signatures look good on mobile, and desktop (outlook for windows)
- They have an application to install on windows that allows updating the signatures without any intervention. If you are the admin, you can change the signatures in the admin area and after a while, the signatures will be updated on local computers in case they use Outlook as I do.

So, this is very useful and a great addon for any marketing services, where you can manage signatures and promotions like banners etc from one single place and update with no hassle on every single user (customer or not)

Thanks