I am an independent consultant and have done EDI mapping in ProEdi and Sterling Commerce's Gentran. I liked both products, but ProEdi was strictly for mapping and Gentran is a full featured product including VAN services. Sterling Commerce has been good to work with and their tech support is excellent. I always get questions answered and usually don't wait very long on the phone to get a technician. Gentran mapping is robust and easy to work with. I have developed maps for 810, 820, 832, 850, 852, 856, 867, 875, and 880. Gentran worked well for all these maps.