Eminently usable, but pales in comparison to the real thing. I have both an original vintage "metal knob" 33609, and the JD reissue (the former of which is worlds better than the latter), and while this plugin sounds quite good, it doesn't capture the character of either hardware unit. Certainly usable and great-sounding, but I'll still be patching in my hardware for more critical processing duties.
I personally don't like a compressor without full parameters but this one is very good for gluing my mixes.
This Neve 33609 isn't really blowing me away. I actually liked the SSLE channel better. Maybe I am not a Neve fan. It does sound warm, but kind of dark, on individual tracks. However, as a bus plug in it does seem to glue the whole mix nicely.