I have the hardware and this is somewhat of an exaggeration labelling this an emulation of the real thing.
There is something wrong with this plugin, I'm not sure what it is. It's close but no cigar from me.
The more gentle you are the better it performs. But you can slam the hardware and it still sounds "correct". Until you can do the same with this plug in I have to be honest and say it falls way short of the mark.
I think Neve gave UAD some dodgy circuit digrams to model this.
Time will tell.
I'm sure there are users out there who worship it.
But it doesn't react like the hardware when slammed, so what's the point?
The plugin imparts a certain lifelessness that the hardware doesn't.
The UAD SSL G buss compressor is a much better emulation IMHO.