My first thought was that they probably wouldn't work well if you had to use a bridge.
My second thought, (see, I can have more than one some days), was that you could lean them against your table and they wouldn't slide off to the floor like regular cues will.
If I ever run into one, I will do what they do in Texas. El Paso.
Hard enuff for me to make a decent bloody shaft that is round, let alone a triangle shaft.
However, I can make square ones as they are pretty easy.