I don't know that I am sure they are non-directional, but I looked at them carefully and there is no arrow or any other indication on the sidewall that they need to rotate in one direction. Plus the tread does not look to my admittedly unskillled eye like it is directional. And the manual literally says not to rotate "2WD models with 18-inch or directional 17-inch tires."
I am a pretty tame driver. How many miles should I expect to get on these tires?
My Dunlop Maxi's had about half tread left when I took them off the front at about 12,000 miles. I'd guess you might get 20,000 plus miles. The OEM tires were usually made to be sticky and hence a softer rubber compound that wears faster.
As for directional, they should show a definite non 90 degree angle to the tread pattern and shoulder sipes for wet weather water squishing. Turning those around is also going to make them tend to hydroplane more. You can, however have them dismounted and remounted, switch car sides and keep them rotating the same direction as they have been. If you need balance or alignment that's a good time to do it.
It's just that I haven't seen or heard of any non directional OEM performance tires, not that they don't exist.