Over half of the internet combined info in the cloud is on Brass cleaning, they other half is best bore cleaner!

Does this surgically clean brass shoot smaller groups than run of the mill brass with a dirty interior and encrusted primer pockets?
Sure it does...and if it doesn't... it looks really good not doing it
As has been said before pistol brass can be a bit sticky...even in carbide dies. It is somewhat redundant but I give my handgun brass a light spritz of lube anyway whether super clean or not. Makes for a very smooth run through the dies and smoother press operation specially when using the progressive presses
I got bit too! I went ahead and picked one up off of Amazon after I got my refund from PayPal.Pay Pal got me a refund and I'm cleaning cases in the old Harbor Freight vibrator thing again. Sigh!
Thanks for the insight. Considering how unimportant cleaning brass is, especially for loading pistol ammo, which is about 90% of my reloading, I'll continue to avoid the wet tumbling process. It'll continue to be ground walnut shells and liquid Flitz for me in my old Lortone QT-12.I owned an RCBS rotary tumbler long before the SS pin cleaning method became the thing. That machine is too expensive now, it is a good machine if you can afford it.
I use low sudsing Cascade dishwasher machine detergent in this tumbler because the RCBS tumbler has a small vent hole in the lid. High sudsing detergents like the automotive wash and wax will cause suds to ooze out the hole.
I still use the Simoniz wash and wax I swirl 50 cases at a time in a 2 pound margarine tub in a litre of water The waxed cases seem to greatly reduce the amount of brass that gets bonded to the nose of the expander die plug.
A Lyman case separator fits perfectly into a home depot 2.5 gal bucket.
I punched 8 half inch drain holes in the side of the side of the bucket just below the sieve. This lets rinse water flow out while the pins get sluiced through the sieve to fall to the bottom.
I dry the case on a couple of cheap Walmart grade cotton hand towels over night, or in a warm oven on a large banking pan.
I dry the SS pins so they don't grow a mold or get stinky. I dump the SS pin on one end of a large baking pan. Elevate that end so all the water flows out of the pile of pins an down to the low end of the pan.
Sponge out the water, spread out the pins across the pan and bake them in the oven till there dry. A paper cup with the rolled rim cut off makes a great scoop to get the pins off the baking pan and into their plastic storage jar, a magnet collects the stragglers.
I used to use TSP mixed with the detergent but I found it made the wash water too slick and oily feeling. I think the slickness interfered with the pins ability to scour the brass and extended the time spent in the tumbler.
Tumbling does peen the case mouths a little bit. I check the degree of peening and run a LEE de-burring tool on the case mouth to clean up peening I can feel or see with a magnifying glass.
I like the LEE de-burring tool because it not an aggressive cutter.
...There seems to be an obsession with making brass look like virgin factory stuff. Some here have already admitted that "surgically" clean brass is too clean and may stick in a die. Hard for normal folks to associate "surgical" with cartridge brass and I don't really understand the need for liquid cleaning rituals, drying brass, steel pins, etc., but then, I also fail to understand the compulsion to wax a handgun and take pictures of it.
However, we live in America. If we can't make something complicated and time consuming beyond all practicality, we often don't want to get involved. I suppose I'm too busy with handloading projects and shooting to get involved with the ancillary busy work that seems to thrill others.
My aren't you condescending! Pride in ownership has varying degrees. Some are higher than others.
I prefer to see Americans as innovators. If one doesn't attempt to "make it better" than it will always be the same.
In America you have the right to stagnant or innovate, to succeed or fail, to make smart helpful remarks or condescending remarks.
Nothing was intended as condescending, but some won't pass up an opportunity to be offended by another's opinion, even it's fact-based.
Living the Tech Life
The Lyman green tinted corn cob media I dry tumbled with always left my cases slimed with a film that I didn't want to remain on the cases.