The Waves SSL plug-ins are alright. Well, actually there's two angles you can take:
In comparison to an actual SSL
If you've worked on an actual SSL enough and know the sound, the SSL plug-ins do great things, but is still no SSL. It's not thier fault, computing power can only do so much to emulate a million dollar living and breathing electronic piece of analog circutry. That smooth, streamlined seperation I was expecting wasn't there.
The master buss compressor is far more transparent and dominant in the real thing. It's a complete and more immediate sound to the overall mix. In the plug-in version, things get muddy and closed up real quick when you're not careful. I'm less afraid to switch the buss compression in on the actual board.
It dosn't come off quite the same way. I can't quite put my finger on it, I just know it's not there.
In comparision to other plug-ins
I think these are great plug-ins to have. They are very functional and do offer a level of sonic independance. They retain the original layout on the EQ section fairly well. Just enough to let people know it's an SSL modeled plug.
The analog on/off feature does give a nice subtle type of sound to choose from, which does bring a nice smoothness to somethings. The gates, routing and compression also does bring another unique sound to choose from in the plug-in world.
However, I do agree with xstatic on the compression. It's okay.
I think in that context, the SSL plug-ins are less likely to dissapoint.