Here is the older style axle and the new XL.
here is the XL dogbone and your old dogbone. You did not say anything about snapping dogbones, but that has also been an issue. I think they addressed that as well.
I plan to convert a pair of my trucks over to the XL width. It takes the differentials, dogbones, axles and spacers. You can get by with just the out drives instead of the differential, but if I am spending over half the cost of the differential for outdrives, I am spending the other half and getting the whole thing.