I picked up a little ultrasonic in CA when I was there last year. Vinegar is likely going to work for me, until proven inadequate.
A buddy of mine worked in the appliance repair biz for a decade and has made an oath to never buy a Bosch appliance. He said they break at the tip of a hat and are expensive as hell to repair, with delays for parts, etc. He really hates them. It surprised me. I've only seen one and it was on when I was looking at it. I couldn't hear it!