First off, the app itself deserves 5 stars and is a very usefull tool to to tailor the soubd of your AVR to your room and your personal preference.
I deducted 1 star, because this app should have been free, given the cost of the audio equipment it is designed for.
Regular Audyssey setup is quite low on bass, which is not ideal for (rock) music, giving a thin, mid heavy sound. Pure direct goes the other way, not compensating for room dynamics giving booming bass.
The app does take some time to get to know and tweaking your sound takes quite some time. But when you’ve nailed it: so much better than standard setup.
Highly recommended even at this price.