This kit works well with my latest revision K1 Max that came the Unicorn hot end system. I've been mostly printing PETG and PLA with the 0.8 nozzle without any issues. The nozzles are easy to change with the small two-headed wrench that comes with the printer; they're not really designed to be removed just with fingers as Creality shows in the product pictures. I haven't had any leaks or printing issues, just tightening until I feel a bit of resistance. The only issue with the installation is Creality's tight silicone sock that makes nozzle changes harder than they should be.