In my opinion it is worth every penny! I use a combination of media with a little bit of the Dillon Rapid Polish and when the brass is done tumbling not only do they look brand new, but reload much easier.
Especially if you are going to reload .223 or .308 that is shot from assault rifles
they always seem to get extra dirty. I can't imagine reloading without tumbling first, though I have only been reloading for a little over 20 years, I typically reload over 20,000 rounds per year (10,000 seems to be .223 lately).
My Dillon press just seems to hum better for some reason. And maybe it's just me, but I think a clean round just looks better and performs better loading/extracting. Besides they are super cheap to by and use hardly any electricity (just "set it and forget it")