I have normally brought Mars Coat Kings & then the replacement blades which are as expensive as buying another brand complete Coat King.
I have recently brought show Tech brand half the price of Mars my thought being I could have 3 of these to one complete & one set of replacement blades so cost wise much better.
I am using at the moment & results are just as good time will tell if they last as long, they have the same holder system as Mars so I think Mars blades could be fitted