I have always logged my dives. My husband calls me a compulsive packrat. One day when I'm a little old gray haired lady I want to be able to pull out my massive collection of PADI log books and be able to redive all my experiences. If I do a stretch where I dive the same area I will find something to comment about. I write my opinions (which I always have plenty of opinions). I evaluate gear for likes and dislikes, changes that need to be made. I opine about the dive operators and the boats. What works weight wise and what doesn't. Class observations on what we can do better when we teach a student and what worked really well.. There's alot of stuff that happens on a dive that seem small, but can be valuable down the road. Keeping a log helps remember that stuff. Plus as I write my log a few hours or a few days after the dive, my husband and I sit and just go over the dive and we help each other recall things of importance. It's a chance for us to just relive the dive again together since he's my only dive partner. Thenagain, I am just a packrat that has kept all my old dive logs and will continue to do so