As much time as I spend reloading I like to be proud of my finished product. With a tumbler my reloads look as good as they shoot. Also I think good shinny brass just works better in autos.
I use Lee media and find that it cleans & shines very well and lasts a long time. I clean all my brass before sizing and find that it does stick in the primer hole but when sizing the de-capper pushes it out with no ill effects.
IMO a tumbler is well worth the small expense.