I had L81 G20 Driver and Wood, immediately when I reached L88 upgraded to R11 Driver and Wood. My game improved, R11 have higher trajectory.
On Conga, Olympic, RSG, Bethpage - long par-3 ball is stopping better on green sometimes deadly without roll. G20 usually had few yards roll and ball end up in rough. Also on high winds distance is better because of trajectory and more opportunity for eagle when I need to put ball on green in 2.
I was able to put ball on green on Par-5 Olympic, KIA, Oakmont, RSG more often with R11. Cost of wood is not high so in my opinion is worth to have this club, especially when you have already R11 driver, always nice to have same meter speed.
Edit: Please look at replays I saved for you from Conga:
www.wgt.com/replay.aspx?ID=d511752f-a5ec-4d2e-bd72-a19800c0f27b
www.wgt.com/replay.aspx?ID=8d438cbf-2b31-4d39-af83-a19800c33926