I was really inspired by James Wiltshire's parallel processing demo, a technique I've used quite a bit but not really to this extent. Also my parallels tend to occur inside a combi using a 14:2 as a submixer.
I thought I'd have a go replicating this demonstration in R6. This is fairly easy to do with spiders but a needs a bit of manual routing. Making a bus group is also a little more cumbersome but it works. The downside is the mute/solo buttons don't quite behave properly - soloing the group channel will, naturally, mute all it's sources - only a minor pain.
The beauty of this method is having the full SSL console strip for each parallel so you can apply dynamics and eq without a ton of MClass devices in a combi.
I've added some automation and annotations to the demo for those new to reason and/or parallel processing.
Hope this is useful.
James Wiltshire's Demo: http://www.youtube.com/watch?v=N45OAHDWakw