Reached L96 a couple of weeks ago and have found the Bertha driver to be AMAZING. Far more accurate than the SLDR (the occasional foul ball the SLDR was known for is not there with the Bertha) and MUCH longer.
I wont be reaching L98 for a while, but in case WGT brings back the L93 R11, how much better, if any, is the R1 compared to the Bertha? If it is better, it is most certainly an AMAZING driver