The Smithsonian tumbler represents another child orientated polisher or one which could be ideal if you want to just dip your toe in the water to see what rock tumbling is all about.
Fairly small and compact in dimensions it is easy to locate and easy to add and remove the barrel when required. Various reports about this brand are saying that the container will wear after a few tumbles, generally around the indents in the barrel where the stone puts more pressure on the plastic as it rotates.
This causes the contents to spill out. Not good. Regarding noise, it is fairly quiet compared to some with almost no volume coming from the motor – just the usual bashing sound of the rocks hitting each other – which really cannot be avoided on any tumbler unless external proofing is put into place.