Bernard Spil has done a wonderful job in importing and maintaining LibreSSL for HardenedBSD. LibreSSL in base has undergone thorough testing over a period of multiple months. We use LibreSSL in our infrastructure. When we publish our first official release, HardenedBSD 11.0-RELEASE, LibreSSL will be the default.
We have now enabled LibreSSL by default in the hardened/current/master branch. We have started a new package build with LibreSSL enabled for that branch. We are also building binary updates that will get pushed out within the next six to eight hours.