I'd used SRS iWoW and loved it. So, when SRS came out with Audio Essentials, I didn't hesitate to purchase it. Now, at some point, SRS was purchased by DTS. Audio Essentials is a BIG waste of money. If you manage to get it to accept the key, the sound is outstanding. However, it relies on SoundFlower software ( a beta version was uploaded in 2012). Among the most annoying problems is that Audio Essentials won't hold its key. Anytime I closed the app or restarted my Mac, I would be required to reenter the software key. Also, there are a lot of random conflicts between the Mac's sound software and SoundFlower.
DTS has proven itself as the supreme loser in customer support. When I started having problems, I sent an email to their "customer support" email address. I listed the problems and said I thought it was only fair to give them a shot of correcting the problem before I started shouting my experience with their software all over the internet. I was shocked and overjoyed when I received a reply the same day suggesting there may be an error with the key. They asked I send them the key and they'd check it.... tick tok.... tick tok... Months went by and no word from DTS. I sent another email asking about the status..... [cue crickets chirping in the background]. I've since deleted what's now called DTS Audio Essentials from my Mac and reverted back to SRS iWow (I think DTS discontinued iWow -- probably because it worked as advertised).