I have been using Kern for Arc since day 1 release on a month key which has been extended a few times due to downtime comp. First off the provider seems decent. They are active in chat, they take feedback and they are quick when getting things updated. I have used a lot of different providers over the last 10+ years and Kern stack up nicely against some of the more trustworthy providers.
Aimbot - 7/10. It works up close and personal when you need it most, and is good for corner peaks if you like that sort of thing. Can be let down by prediction. Sometimes but rarely it flicks to feet even with low fov values.
Esp - 6/10. Freezes more often than I would like leaving stuck drawings on your screen. Usually lasts 5-10 secs. Could be better in the loot/container dept as not all containers can be filtered but most can. Flying arc position gets offset once you start blastin'. Not a huge issue, but its a thing.
Stability - 5/10. Sometimes the menu doesn't show on inject, I have had bsods here and there, mainly once I close my game but once or twice whilst in stash. Freezing esp affects my rating. Other issues like arc not showing even though the option is toggled are also a thing but it is fairly rare and mainly a none issue.
Security - 9/10. I have 100hrs topside and I am still going strong as of today with around 300 raider kills. They lost a point here as there was, as far as I understand, an injection method detection (compatibility) in the first week or so although I was not affected.
All in all Kern can have my money for the service they provide and I don't feel like I am eating shit.