Mikeapolis wrote a review of SRAM GX 1x11 Rear Derailleur on September 20, 2018
Familiarity: I've put it through the wringer
This came standard on my Overdrive Pro. I recently rode an extremely muddy Chequamegon 40. Granted it was ridiculously muddy, but the derailleur stopped shifting at mile 20. I had to tap it with my shoe to get it to engage. I washed the bike off at the race and cleaned out the crud. I noticed that the roller clutch was barely turning and the same for the top pulley. I took them off and gave them a good cleaning and lubed them up. Not the same feel as when it was new, but way better. The local shop wanted $40 for a new pulley set. I think I'll just get a nicer derailleur after this thing dies.