I never liked "kits" as some items included in a kit were not used and I enjoyed researching each tool before I bought it. All kits come with the one manufacturer's tools and some manufacturer's tools aren't too good, one may make very good presses, just passable other tools, but also may have poor tools included in a kit. I find a tool that is best for my reloading style/methods regardless of manufacturer...
FWIW; I reloaded for 12 years before I got a tumbler. I just wiped each case with a solvent dampened rag as I inspected it, first step in reloading. Nope, no ruined dies and no scratched chambers. Just some info to let you know a tumbler along with deciding on media and a "formula" isn't really necessary just 99% cosmetic, and an ego feeder...
Kinda like chrome/mag wheels on your car. No better than painted steel wheels, they just look better...