I am currently leaning toward making the switch immediately after my commercial check ride and start fresh with a logbook that inherently shows a higher level of professionalism.
I inherited this empty logbook a few years ago but now have all my flights properly documented through my instrument rating and all up-to-date currency and time building toward my commercial. I am using an old Jeppesen style (the small black one that some here would be intimately familiar with - the green-colored pages and never enough room to write anything in the remarks section, other than abbreviations). I realize most would say when your current logbook has no more pages, but I'm curious for those times when you want to transition to a newer style logbook from a logbook originally produced in the early 70's. Seeking others advice and your ideas on when to make the switch to a new logbook.