No issues with Catalyst 13.1 and PD11 so far in use. No visible advantages over Catalyst 12.10 either.
I had initial stability issues with PD11 after Catalyst upgrade to 13.1 (see my other post on this subject). I managed to overcome the issues by first de-installing Catalyst 12.10 - reboot - then installation of 13.1.. That helped.
I am only using PD11 to trim video streams recorded from Sat TV and render them to either MPEG2 (SD ) or AVC HD 264 (HD). Occasionally multi-trim but no sophisticated editing so far.