Given the trouble audiophiles have in correctly integrating a room, I highly recommend this approach in general.
The one thing to keep in mind is that auto setting software is not all the same. I really like the way JL audio's built in software sets their subs, but they are super pricey. You definitely should listen before buying if you can, otherwise it's worth keeping an open mind and being prepared to tweak.
A gently descending curve from 20Hz to 80 Hz to my mind sounds much better than flat.
The one thing to keep in mind is that auto setting software is not all the same. I really like the way JL audio's built in software sets their subs, but they are super pricey. You definitely should listen before buying if you can, otherwise it's worth keeping an open mind and being prepared to tweak.
A gently descending curve from 20Hz to 80 Hz to my mind sounds much better than flat.