I used to work as a developer on a nice commercial CMS/Ecommerce system called Odyssey/C8:
http://www.chaptereight.com
I've tried quite a few open source and commercial CMS systems - MODX is the only one that has rivalled Odyssey in terms of development extensibility and "out of the box" usability.
I've recently started working freelance (still on my first job), so Modx is a God send.
It keeps developers happy, and the CMS is so intuitive that you could literally let your Gran loose on it and come back to find a WayFinder menu and neatly organised site content scheduled for publishing next Monday!
I also know of UK web agencies that use Modx most/all of the time now.
Companies are abandoning the development of their own in-house CMS in favour of MODX.
This is a very good sign - the commercial sector in the UK is quickly cottoning on to a much needed, flexible CMS that they can base their custom AND vanilla websites on.
From what I can see, donations should be flooding into Modx from agencies and freelancers...
It only takes a short leap of imagination to see Modx pulling some people away from Magento for ecommerce.