I’ve got a Griffin Checkmate QD. To be honest it was the only rimfire can with stainless internals that I was able to find in stock locally in the pre-41f panic, but I’m really happy with it.
The QD mounts can be a bit hard to find sometimes, but I’ve got one on all of my .22’s now and it’s super convenient. They also sell a direct thread version, or you can buy a direct thread mount to replace the QD if you prefer.
I really wanted stainless steel for the internals, so I can just toss the monocore in my rotary tumbler with stainless pins for cleaning. A few hours in there and it comes out looking brand new, no scrubbing or solvents needed.