First off, I don't want to get into a pissing match with another vendor, but facts are facts.

The borg box carries a remachined pitman shaft. The tolerances between this shaft and the rack block are tighter and much more consistant than the 50 year old boxes. The valving is light years ahead as well using the same technology as rack and pinions, not reaction springs like the factory boxes. Lastly, the 14:1 ratio is another big plus. Having sold 150 boxes to happy customers and installing another dozen in the shop and having one in my own car for the past 2 years, this is a worthwhile upgrage. In fact, Kevin Westley has one going in the Dart Sport build that has been posted here several times.