I'm not sure where I got the first one of these cleaners but my wife and I really liked it.  I've ordered three more on Amazon.  It's a great small form factor.  The stiff bristle brush really cleans out small crevases.  It shines up my wife's engagement ring better, and obviously much faster, than our pricey ultrasonic cleaner which is a major pain to set up and clean.

If I had a gripe it's that way more gel than necessary comes out on the brush which depletes the cleaner faster than necessary, but not really much of an issue.