I have played with one and thought about one, but with a track saw I see no need for one. I do not use a table saw often, and it is always for rip cuts or small items where I am using a sled. My Bosch 4100 is not a great saw and the fence is lacking but it does get the job done. Last thing I want is more stuff to be moving around to make a few cuts when needed. I did set up some hanging hooks so if I need to make really long rips I can use a plastic picnic table to outfeed onto while solo.
What table saw do you own? Do you own a track saw?