I have Shimano 6800 on my Habanero. They shifter perfect and no issue but that said I have over 45,000 miles on them. I already have an R8000 rear derailleur and that was better than the 6800. Anyone here have experience with if this upgrade is really worth it? I could also upgrade to R8000 sifters for about $80 more for a pair. Shifters normally just don't go dead but give a chance while they are stuff is around what do you think? IS R7000 better than 6800 the R8000 should be but who knows?