tested yesterday in pretty much 'anger'
no chainguide, raceface wide/narrow chain ring and xtr clutch mech
no drops at all, its deadly silent climbing other than the usual 'whurring' chain sound and i tested it on all the usual stuff i do (rocky descents, steeps steps, fast descents, jumps etc) and not once did it drop, by the end of the ride id actually stopped thinking about checking it was still on
i havent adjusted my clutch in about a year, so when i got home i checked the tension (after the first test ride) and it was still not actually tight or done up as tight as can be, so i adjusted it even further to have less slack again and i'd imagine that will be even better/less chain slap!
the only time i could see it maybe coming off in that setup is on really rocky descents in 10th gear (1x10 setup), as obviously the chain is at its slackest point then, but to be honest very very very rarely would i be descending/have a need to descend the mega rocky stuff in that gear, so worth noting if you descend rocks alot perhaps worth shifting up a few gears (mid cassette) to make the chain a little more taught
didnt really think it would work that well, im massively impressed TBH, i cant honestly imagine any xc racers losing the chain on pretty much any course ive ever seen, given what i rode it on yesterday in the peak district at speed
time will tell if the wear on the front ring will cause issues with the chain drop but so far 1 ride in its pretty mint!
i do think the xx1 and wolftooth chainrings look like they would hold the chain even better, the works and RF ring looks pretty much like normal chainrings other than the thick alternating teeth, where as on the xx1 and wolftooth ones they look alot deeper the teeth, sort of like the chain would sink/mesh deeper onto the chainring...that said the RF has proved fine so far!