I have to agree with R1000S. It may be a nice feature to have, but in all reality, I would like to have one, but I will do myself worlds better to learn to ride better.
However, just like anything else, if you have the $$ and nothing else to spend it on, then go for it. It's not coming out of my pocket. I would rather spend the dough on an additional track day. Just my 0.02