well, your ass is thanking you, but have you noticed how your package is, now? no? you'll figure it out in a few more rides !
its because the human body is made to take a bit more pressure in some points while sitting. But airhawk evens everything out. You end up with other kind of pains. You'll know.
I basically still shift a lot, but the stingny pain after 400mi is gone, that I admit. just have to manage the time with and without the airhawk, if you can shove it in a luggage (which you likely have if you deserved an airhawk).
Oh, dont ride in rain with it. Not that it does anything to it, but think about when the sun is back and you remove the rain gear... the seat is still wet.