If you haven't had a chance to mess with this thing - GET IT!!!
I have just about every ITB compressor you can think of - Waves SSL, API, Chandler/EMI, UAD, Stillwell, etc... and "The Glue" absolutely blows me away. For a 2-buss compressor this thing is stunning - blows the doors of the Waves SSL stuff and it's not even close. It's modeled after the SSL 4000 but IMHO (and many others), absolutely blows away the Waves SSL. I bought the Waves SSL bundle a while back and was just never impressed with the compressor - it's compression characterstics are nice but it kills the stereo image. I demo'd the UAD Buss Comp (also modeled after the SSL buss comp) and it didn't blow me away so I never bought it. I have now found the answer!
Soooooooooo nice folks and it's $99. Trust me, I don't care how many compressors you have - this is one you want in your arsenal.
I'm in NO WAY affiliated with these guys - just a mega/super fan after running a few of my mixes through this thing. Right now I use my Portico 5043 into this thing into my UAD Precision Limiter on my 2-buss and could not be happier with the results.
www.cytomic.com There's a massive thread over on Gearslutz on this thing - rave reviews (and how I found about it):
http://www.gearslutz.com/board/new-product-alert/363849-cytomic-announces-glue-bus-compressor-effect-plugin.html
Enjoy!