Had SLX on a 2016 MTB, upgraded to XT for my 2019 build. The only difference I can tell is that the shifter feels that bit ‘nicer’ to use.
Dead easy to set up and no problems so far.
Maybe not relevant but my first experience of owning a SRAM group on a 2017 gravel bike has been one of constant problems EG, BBs made of cheese, can’t get the crank fit just right, can’t get the crank off without a length of scaffold pole, regularly have to reset the callipers, callipers have zero tolerance that doesn’t allow for a bit of grit or micro warped disc, eats sram branded pads and rotors need replacing soon as a result, pistons stick occasional, hoods are now slack and rotate, constantly have to reset the shifter lever position, plastic shifter internals replaced due to failing, Spring in the mech seems to be getting slack. Jockey wheel bearings changed after approx 1500 miles.
Can’t wait to get rid of it when funds permit, utter shyte……..
chains seem ok though.