We have been running EDGE for over a year without much problems but
then I am usually capable of finding and fixing problems myself in just
a few minutes and before Cpanel is probably even aware of the problems
so most Edge issues are non-issues with us.
The same might not hold true for less experienced administrators and for
those, I would recommend using a more tested branch.
For those who know there stuff though, Edge is definitely the way to go!
PS: mod_security works just fine with Apache 2 and 2.2 but you need
to compile manually and replace the module installed by WHM