its more than pretty. its a damn fine channel compressor. if onyl they'd made each unit as a seperate vst. nebula has a lovely sound to it but its a nightmare on my cpu. i use the analog channel on 3free to record out. gives a nice warmth and is lovely on the tops.
i agree i cant see this being used for mastering but if you've got a decent cpu its a lot better than the more expensive competition.
as for techno, i couldnt see where it would be used. the opto though is a differant kettle of fish.
all ive tried the 670 on is that rock track above but it did the trick nicely.