Sram sx is cold garbage, nx rear mechs not much better.
I actually tried to warranty a 3 week old sx rear mech off a kona that had not a scratch on it, but was so wonky it wouldn't work 10th to 12th. Zyro stated "age related wear is not wareanty". Yup 3 weeks
The play in the cheap SRAM ones is the mech itself, joints are as baggy as a ten year old acera.