I have a Thumler's Tumbler Model B High Speed and love it, I also have a vibratory case cleaner I used for years prior to getting the Thumler's Tumbler.
AccurateShooter.com is a hangout for competitive shooters and below are the negatives to the case cleaning types mentioned by them.
1. Vibratory case cleaners with abrasive compounds are not liked because it is felt the abrasive compounds will damage the bore of their custom barrels.
2. Thumler's Tumblers type cleaners can peen the case mouths and the ultra clean inside of of the necks causes bonding between the case and the bullet causing velocity variations.
Now that I have the Thumler's Tumbler Model B High Speed I would not use anything else, because many of my cases end up on the ground from my M1 and AR15. This method removes any abrasive dirt and grit that can become embedded in the brass and scratch your reloading dies, I also do not shoot in competition or have any custom made barrels.
I get the impression that more competitive bench rest and long range shooters prefer the ultra sonic cleaners. This method doesn't expose the cases to vibratory abrasive compounds or tumbling with stainless media and bumping and grinding the cases together.
NOTE: The competitive shooters mentioned above take great pains weighing, uniforming, neck turning etc their pampered cases and are very fussy.
Below, Remington .223 cases after using my Thumler's Tumbler to clean them and waiting to be resized and prepped.
Rinsing and separating the pins.
Drying the brass.