Q Sound never worked well in arcades because it was rarely on games where you could stand directly and equally between the two speakers. I didn't think Ecco had any good effects, even with headphones. Q Sound was all hype, no bite. It just happened that Q Sound had a good marketing team and a few in the videogame industry fell for their spiel. Dolby Pro Logic and Pro Logic II are both proven technologies with years and years of research behind them. Not that they really matter any more.