I play the R11s and think that, chime for chime, they give the best performance. That being said, I bought the full G20 set and love playing with them. It's a more relaxed game. Like any clubs, you have to spend some time getting to know them. The 3I plays longer than it says so the gap between the 3I and 3W is not as big as it seems. I have had a number of sub 60 rounds with the G20s, so you can certainly go low with them. I have a 58.37 average and think these 2 sets are the best WGT has to offer.
The R11s driver is unbeatable.
Good luck!