With PR 1.3 flashed, I don't get the update notification for PR 1.3.1 with the maemo.muarf.org mirrors, is it normal?
Anyway I think I will use CSSU but I am just curious if the original Nokia SSU can display OTA updates with the mirrors.
Maybe this issue could be mentioned on the wiki: http://wiki.maemo.org/Seamless_Software_Update