True. When I got mine, I was a bit overwhelmed by the available adjustments. I followed the recommended settings and was fine. As I read some more, and had some questions, I called Rythmik. They explained the answers and sent me another, even more simple, suggested setup. I've been enjoying mine for a couple years now.
There are still a couple adjustments on the sub that I don't fully understand and don't mess with. But I've never had a problem at my ears, or on a meter, or with Audyssey. I consider it kind of like our dishwasher or washing machine. They have cycles we never use, but they're there if we want them. (BTW, that's the royal "we". I never use either of those.
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FYI, the FV15HP was my first big boy sub. After a while reading here, I decided to get a second sub. I got the SVS PB13U. It cost more. After playing with it on both music and big boom movies, I couldn't really tell a difference between them. Now I use them together. Very effective smoothing out nulls in the room. Even so, either is strong enough alone to thump your chest and shake the room. I wouldn't hesitate to recommend either, and I can't say one is better than the other.