I have a Frankford brass tumbler. It does a better job cleaning the brass than the media type and with out the dust. The only problems I see with it, if you can call them that, is trying to get the brass dry afterwards. I used the oven on low heat for awhile, but eventually bought a Franklin dryer that comes with several racks that can be stacked. The primer pockets are cleaner, but the steel rods do get stuck in the priming hole occasionally and across the case mouth if the right size caliber. Just got to watch for it. And you need a cleaning solution. I've used Lemi-Shine when I didn't have the Frankford solution for it and distilled water or you'll get spots on the cases.
If you get one I would suggest getting the magnet too to help pick up and separate the steel pins. I also use a media separator to help with the pin removal.
