First the warranty is better so that's one obvious reason why it's a better half shaft. Sounds like they used better parts in rebuilding it and chased the splines so installing should be easy. If they do actually chase the splines and can get them to you without damage it should be a good product. Let us know what you order and if you get what they say they do. Inspect the splines real good if the shaft slips in and all the holes line up that would be cool for just $77