We'll need Mike to chime in here, as he has more experience with the DCs then I do. I think the TF Rubies are a reasonably mature method for designing TF Joinery in SU, that includes the ability to generate shop drawings and material lists. I know of several other professional timber framers using it for that.
The DCs are brand new with SU7. Both Mike and I see some exciting possibilities for enhancing the way we design timber frames that take advantage of this new feature. We're still trying to figure out exactly what shape that will take. It will certainly take some time and effort to pull it all together. One thing to be aware of is that you cannot create your own DCs with the free version of SU7. You need the pro version. I think Mike's goal is to provide a library of DCs so you don't necessarily need the pro version. CB.