It takes about a week to get used to it- I learned it faster than I picked up the trackball we had in our computer lab in college
But there is zero benefit. This isn't like Coke vs Pepsi. Hell, it's not even like QWERTY vs Dvorak. Starting from a blank slate, the two methods have zero difference. But because there is ~15 years of precedent behind the accepted norm, altering it is demonstrably a waste of everyones time, and certainly abnormal. The fact that they have to put a goofy little popup explaining it at the beginning of the OS setup (and for each subsequent new user who logs in) and making you do it to be sure you understand is a tacit admission of this by Apple. Change for the sake of change. Only Apple fanboys would eat up something like that.
And yes, NOW I'm hater-ing
But really I love Apple trackpads otherwise, and thankfully the option to revert to normal is there, so minimal harm done to people who live outside the RDF.