Quite certainly most folks around here have already tried ReactOS. I'd like to mention that the core development team is proposing a sustainable open source business around the project at kickstarter. Improvements made to ROS by developers working in full time brings interesting possibilities in terms of start using ReactOS more often on boot disks instead of Windows PE.. 
You find more details at http://www.kickstarter.com/projects/thorium/thorium-core-cloud-desktop
