I don't use a commercially sold logbook. I do have software for my computer should I choose to download the data from the dive. Keeping the data only in the software is a mistake in my mnd since I've been hit with a virus more than once and lost what was on my harddrive. So now, the download software is just a tool for profile purposes should I want to see them. I don't bother downloading data on quarry putz dives, but I do download profiles on technical dives & instructional dives.
I also don't want a bazillion books lying around to keep track of.....PITA and clutter. I bought a Trapper Keeper Zipper type binder during Back to School years ago and keep my diving info there. I've looked at different commercial log book features and pulled out what criteria I've found useful and made my own log pages on the Excel Spreadsheet program. I currently get 6 dives to an 8.5 x 11 sheet of paper, (3 front, 3 back). If I've downloaded the profile, I can punch and insert it next to the corresponding logbook page. I also keep my pertinent c-cards, passport, dive tables, site maps, etc. in that same Trapper.
I've got a biggie 4 inch binder that I transfer the sheets to when my Trapper gets to tight. There I also keep class rosters & pro related stuff.
I also downloaded for giggles the PADI software for tables and logbook for my Palm. No thanks, way to big and SLOOOWWW. Gimme paper for archival purposes. Deleted it.