I do the same. My paper logbook is the main logbook, but it's a lot easier when I'm on the road for an extended period to enter everything into Logbook Pro. I can do reports or look at snapshots of a given period of time to check currency and so forth. When I get home, I make all the paper log entries.
My Logbook Pro isn't complete; I've been working on it for a couple of years now, but entering all the flights from previous logbooks is tedious and time-consuming (and boring). I originally started the electronic logbook as a way of catching math errors that might have crept in here or there, as well as researching things faster. It's slow going trying to enter previous flying, to prevent any errors from creeping in.
Logbook Pro is the best of the various electronic logs that I've seen, and it's updated and maintained by the manufacturer on a regular basis. They also produce and sell proprietary paper logs, including some nice leather bindings and papers, if one is interested.