Also a logten pro user. I have never heard of anyone not happy with it ASIDE from it being a bit more expensive than some alternatives. It is a fantastic program that will do everything you want it to (certainly I am yet to out-think it).
I used to use a mocked up excel sheet for it but I abandoned it very very soon after trialing logten.
Also, as far as I know a logbook is an official document in terms of what it must contain and that it must be recorded, but there is nothing to mandate the container. It can be printed out from a program, kept electronically, written in a book sold as a "pilot's logbook" or written on the back of envelopes.