it comes with a longer fence, i doubt it is any better, in that it uses the same profile of extrusion, and i imagine the same clamping method.
I haven't read the whole thread, but the advantage of the right hand extension is that it increases the capacity into something useful. When I had a kity 419, i was short of space so tool off the extensions, and used the basic saw. The issue was that you lose a bit of the rail length by the way that it clamps, and become very limited by the width of cut left to use IIRC a 6" wide board was an issue to rip an inch from (it was a while ago now).
Again, I dont know the cost of the bandsaw fence, but one further alternative would be a biesmeier type fence, details online. You could build the extensions yourself for that.