Have not tied a PR but have been using the Improved Alberto for braid to mono. Very slim knot, I've not had one fail yet and it's VERY EASY to tie.
The most critical part of the knot as you'll see in this video
https://www.youtube.com/watch?v=J56O3CZVu7M is that the braided line must exit out of the mono loop the same way it entered. If not, your knot will slip.
Although I never considered it before, I like Togzillas suggestion above of adding some hitches on each side of the knot for some additional assurance.
