Jonathan T.wrote a review of Shimano Ultegra RD-R8000 Rear Derailleur on March 17, 2018
Familiarity: I've put it through the wringer
Purchased the Ultegra RD-R8000 short cage as part of an upgrade to full Ultegra, and this rear derailleur is nothing short of awesome. Easy to set up, low profile design, and it's so smooth I often don't feel my shifts through the bike, only in the change in resistance at the crank. Also, this derailleur seems to require much less input from the shifter, which took some getting used to, but I love it.
The RD-R8000 Short Cage weighed 197 grams on my PT scale.