Electronic log books are legal if printed out and bound.
I also run both though and works well, can check your accuracy of adding easily and when you come to do a log book summary or update your CV it is just so easy.
This has been mentioned on the other site but this is a top program Excel based!!
http://www.users.bigpond.com/pairlawrie/
Remember to back it up though and send a copy else where, just in case!!