I've been running mine for about 12k miles and also have one in the wife's fat boy lo for about 8k miles, very happy with both. No problems with either, running redline in the tranny in both and shifting is much smoother, especially in the softail. I still occasionally get the clunk on a shift into first, but rarely. The wife's did have the whine for quite a while, mine only a few hundred miles if that.
If you follow the other forums, the Hayden has got beaten up a lot in the 08 and up touring bikes - a lot of guys felt the chain tension was too tight and one person even had a broken spring. I opened both ours up after 2k and 5k of use because I was paranoid after seeing some of those posts. I was below the recommended 3/8" space on both installs, but the chain didn't feel overly tight at all and wear on the pad wasn't excessive (more on the softail than on mine, but not excessive IMO). Hayden came out with new springs (same strength but shorter length than the original) a few months ago, I presume to address the overtight issue that some are discussing. I called and they gave me two free sets so I installed them and replaced my pads (even though they really didn't need it) while I was doing other winter mods.
Some folks may have had issues, but I think they are a much better solution than the stock unit. Maybe I just got lucky with mine, but very happy with their performance so far.
Freedom isn't free, remember to thank a vet.
2018 CVO RG lava orange, 117 Stage 3, 14" F47 and a few chrome extras. Boom crap gone.
2016 RG Special Cosmic Blue, 120ST with Dragos 2:1 and TTS tuner, FBI drop seat kit and JNR air ride. Stock audio long gone.