I've played a few more rounds with the BB driver and have to say I like it a lot. I ended up getting a plus bag so I could have 2 sets and easily change though as I don't think this driver suits St. Andrews or RSG, especially in heavy wind. I use the same other clubs and ball, only the driver is different. For these courses and any high wind round I stick with the R1.
So, to answer Jimbog's question, no, this isn't a definitive replacement for the R1, I think you need both to play your best. At least this is my assessment so far.
The 3 wood just keeps getting better, if a little hard to judge distances sometimes. I used it off the tee on Merion #8 last night with a 14mph mostly tail wind. Took a bit off the power and it hit the ball 298 yards, just into the rough on the right side. I certainly don't find it too unforgiving compared to the R11s.