Depriming pistol brass before cleaning is way over the top. If you were shooting for extreme accuracy such as master class bullseye shooting I'd say there may be some merit in doing that. But for regular plinking or other events (IPSC, IDPA, USPSA and the like) depriming is just a lot of extra time for pretty well zero return. And you've already doubled your work load by having to place and pull the lever an extra time to deprime them. Which sort of defeats the reason for getting a progressive.
But I know it's got that "new press smell" and you can't help yourself
Cleaning the brass is a whole other issue. I started out with a tumbler, corn cob media and some Dillon brass polish. I was underwhelmed at the job it did. The outsides looked nice but the inside was still black and crusty.
In looking around there was a lot of success stories about ultra sonic cleaning. I bought a small 1 liter unit and after the first results promptly gave away my dry media tumbler. In fact I just cleaned about 1000 .38Spl cases last night and they are sitting out on a couple of old bath towels drying right now. The ONLY downside to any wet cleaning is that it does take a couple of days to dry. But I've been considering a food dehydrater that should speed up the drying to about 24 hours. As for clean the US cleaner leaves the brass looking like new on the outside and mostly clean on the inside with only some very light staining on some casings where at least the stains look "brassy". And that's miles better than the crusty stuff that was left by the dry media. With rifle brass, which I do deprime first, the insides come out as shiny as the outsides. Also the stains I get are only in the deeper revolver casings. 9mm and .45acp come out bright and shiny inside and out and look just like new.
These days wet tumbling with stainless pin media is all the rage. And I don't doubt at all that it does a better job. But if I can get 80 to 90%% of the same cleaning results as the SS pin provides in 1/4 to 1/3 the time (tumbling times seem to be listed at around 45 minutes to an hour per batch. I've been using a 15 minute cycle) and not need to deal with cleaning out the pins I feel that's a good trade off. Plus I don't need to deal with rinsing or other tricks for removing the pin media. And if the outcome is that my handgun brass has some slight staining left inside the deep .38Spl and .357Mag cases then such is life.
I do know that I'll never go back to dry tumbling. I might need to wait for the cases to dry but at least they can do that by themselves once I've rinsed and laid them out. And any water I miss goes away by itself instead of still being in the cases if I didn't shake them out well enough.
But the choice of how to clean brass seems to be as personal and full of emotion as which solvents and oils to use on our guns. So look around for more opinions and check out some You Tube videos and decide for yourself.
Even I'm not locked in. As a closing note I'm starting to load more black powder cartridge stuff. And the black powder residue is FILTHY! ! ! ! And the stains it causes don't seem to want to wash away even in the US cleaner. So I may find myself setting up a modest SS pin tumbler setup yet. But for my general brass cleaning needs I'm still going to stick with the US cleaner.