Crimson is definitely missing some needed features. My setup:
3 monitors - 2 cloned and the 3rd extended from those. This allows my big screen TV to share the same view as my primary gaming monitor and allows me to use my second monitor as addition workspace. In CCC this was a snap to setup but there is NO way to do this using only Crimson/Windows desktop arrangement. I found this out after reinstalling Windows 10 and installing only Crimson. After fighting with eyefinity settings in Crimson and googling for a few hours I gave up and grabbed the last CCC. Got it done in 2 minutes.
AMD: PLEASE understand that Windows alone does not seem to allow one to manage more than 2 monitors. Neglecting to port that feature from CCC is a problem going forward.