Agree with Nivek and Klinger here. Unless you are riding a wacky stance for your height, about 2.5 degrees seems right. Burton's autocant doesn't really cant as much as a wedged footbed like the Ride or Rome bindings, IMO. I found that I can feel a difference between 0 and 2.5 bindings but not enough to make it a "must have" feature for me. People with knee problems might find otherwise.
I say definitely get it if it's an option.
When I had a pair of Targas, I tried different wedges to shift weight rearward, 3.5 front and 2.0 rear. This is actually suggested by Rome. It can help compensate for riding powder or deeper snow when you have a true twin board; I was riding a Palmer Saga rocker twin back then. TBH, I don't think it did anything. A directional board with taper will make much more difference in float.