I cannot comment on the R1 and R11s drivers but the biggest advantage for me with the SLDR driver is it's ability to stop quickly, with full BS it will stop within 6yds, and the R11 3W with full BS will stop in 1yd.
That can get me onto some greens I would not previously have dreamed about attempting.
Edit: The above figures are from the tee, the 3W takes 17 yds to come to rest with full backspin from the fairway. Of course those figures also depend on the slope at the landing point.