i agree with above, the Burners when I bought them at level 79 were spectacular, but as soon as the R11's came out I noticed a huge downturn in pefrormance, no doubt about it.
I was good enough then to notice the difference in peformance.
So I was left with no alternative but to level up to 90 to get the new irons.
It's all about making money, just as the black R1 was a blatant money maker.
Release a better club early and there are probably more members at level 86 than level 93, so this exercise will be even more beneficial, than the R1 experimen
Level 86 to 89 ( SLDR ) is over 100,000 Xp's