I've owned an Essence STX for about a month now, and strongly agree with your comparisons on the Hi-Fi mode vs. Dolby Headphones. It's funny because I didn't know what Dolby Headphones was when I bought the card, and now it's probably my favorite and most used feature. Without the DH feature enabled, music is flat and fatiguing. But check that magic box, and suddenly you're IN THE DAMN ROOM 5 feet from the musicians. Funny story about that... the first time I showed my girlfriend the difference the DH made, she suddenly got really tense when I turned them. It was late night and our daughter was sleeping in the same room, and she thought I accidentally turned on the large Audioengine speakers full blast! I had to laugh because the same thing happened to me the first night I was testing the DH feature. Anyways, it makes all music better, but ESPECIALLY acoustic/jam type music, as you mentioned. FWIW my headphones are the SR60's. Although I am COMPLETELY satisfied with my current set-up, I sometimes wonder what high-end 'phones would sound like. I have a hard time imagining HOW it could be better.
Gaming wise, I've only played Crysis so far. I can hear when footsteps are close to me or when enemies are rustling nearby in the bushes, but I can't always pin point the direction (unless the noise is really concentrated right or left). Maybe I need more practice? Or different headphones for 3D gaming? I dunno, but it's a very small point given the type of strategy the game requires.
Can't wait until my new sub gets here. Going to run Essence STX --> Audioengine A5 --> Martin Logan Dynamo... expecting good things
