I used to use the paper PADI log book I was given in my OW class, but I lost it. PIA to keep track of anyhow. Now I use exclusively the dive log feature on this site. It is WONDERFUL! Really easy to enter dives. Most of the sites I dive are already setup and easy to search for. New dive sites are easy to input. For convenience it can’t be beat. And for repeat dives at the same dive site it remembers your sites on a pull down for even easier input. My wife is on Divebuddy now, and it only takes me a quick minute to log in both of our dives when I get home. It should really pay off this summer when I go to Fiji. I can just log into Divebuddy.com each night and log in the info while it’s fresh, instead of trying to remember once I’m home.