I have a Thumler's rotary Model B and a Thumler's Ultravibe-18 Industrial. I use both in my apartment, and neither is any louder than my dishwasher. The UV-18 is the best vibrating tumbler I have ever owned. I've had a Dillon 500, a Lyman 2200 Autoflow and still have the 3200 Autoflo. The UV-18i is quieter that the others and every bit as aggressive as the Dillon. Thumler's only makes tumblers and nothing else... and they are good at what they do. Just looking at their tumbler, you can see that is far better quality than the others.
Here is a vid of mine going with ceramic media in it:
http://s23.photobucket.com/albums/b... Tumbling/?action=view¤t=P1040641-1.flv
The stuff inside the cases is what is making the water so dirty.
If you're planning on only using corn cob or walnut, get the non-industrial UV-18. The industrial version is meant for wet tumbling and will be louder without the weight.