Starise
The Waves plug I linked looks to be almost identical in concept. The thing I liked about it was you can sum through it. This should yield the same or a similar result, would it not? It is based on actual consoles too. One of them Neve. Sonar already has both bus and channel emulation.
Mixbus has more than just console summing. It's dynamics processing and EQ. But all these modules are available for the Pro Channel and then some. The closest third party plugin would be Waves' SSL 4000 Collection, IK British Channel & White Channel, and channel strips by other manufacturers, such as TheStrip by DDMF, etc.
Starise
I think a test sounds like a great Idea. Uploading to Soundcloud only gives us a 128 mp3 though. Not sure if that's good enough to tell.
I've used a multitrack from David Glenn's website. Not sure if any of us have the right to redistribute it via forums, otherwise I would post the link to the .CWB project in this thread.
But you can do this test on your own.
To see wht plugins add to the mix it doesn't have to be finished and polished mix. I set the levels and panning roughly to -12 db, then routed groups to corresponding busses, like Drums, Guitars and Vox. Then made some coarse adjustments in 3 dB increments and then made a couple of fine adjustments, e.g., set the lead vocal to be slightly above the rest, dilaled tambourine lower. That's it.
The final step was to enable PC Tube, Console and Tape and pick the console type, tape bias per group of channels (swap select channels, then Control + click/drag to change settings simultaniously).
Once it's done you can audition the mix turning effects on/off (by hitting "E" key) on the fly.