The G20's have great performance with a slow meter, but the truth is they simply do NOT perform as well as the R11's. They don't carry quite as far and I don't find the meter on the R11's fast at all.
If you've just made level 81, the G20's are hands down a great purchase and will easily last you a long time. Besides, it's will take a long time to get to level 88 anyway. By then, you may just want something different and getting slightly better performance to boot is a good thing.