We have been working with SilverStripe since it was released as an open source product in 2008. GPMD are one of only two offical UK partners with the main SilverStripe organisation in New Zealand. We are also listed on the SilverStripe Developer Network.
Being a SilverStripe partner means that we are recommended for SilverStripe implementations because of our vast experience with the CMS.
This short video demonstrates how simple the CMS is to use:
Here are some other useful links to SilverStripe resources: