Our firm has used Litera's Change-Pro for years and have had great success with that product. Word document comparison with Change-Pro is excellent. We don't believe that Word's native compare function stacks up to a product like Change-Pro at all. We have also [used a different comparison product] in the past but most definitely prefer Change-Pro's features and rock solid comparison capability.
Director of IT Services
Womble Carlyle Sandridge & Rice, LLP