Lots of discussions here:

https://pinside.com/pinball/forum/topic/ultrasonic-cleaners

If you are not using one professionally, I’d just worry about the size. I have two: a large one (15L I think) and a smaller one (3L). I tend to use the smaller one more as I primarily am doing smaller parts.

I don’t recall what features are offered, but I just wanted all stainless steel and a heater. The 15L has a valve for draining. I would recommend a valve on a larger one since it’s more difficult to dump out, but not too hard if it didn’t have a valve.

I just bought from “the bay” and haven’t had any issues YMMV.

I bought this one and it’s been perfect.

ebay.com link: itm

Here’s a clean harness drying in the sun

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I was shopping for one today too. I ordered the 15L Vevor “upgraded” unit off of Amazon along with some hanging baskets for small parts. Should have it in a week or so. I noticed that its reviews on Amazon are a little misleading (not all of the reviews are based on the 15L unit). I’m planning to use 50/50 Mean Green and water.

My experience with my new Vevor 15L ultrasonic cleaner ($166 on Amazon): It cleans well. I ran the star posts for 5 minutes at about 50 degrees celsius and they look like new. Some metal parts, like ramp gates and non-deeply-rusted posts came out shiny. Screws with fine threads don’t seem to get super clean even after 60 minutes in a fine mesh hanging basket. Maybe it’s the solution I’m using (Mean Green and water) or maybe it’s just better to buy new screws. Aside from that, my only complaint is that the built-in temperature sensor is useless. They must have mounted it too far from the liquid it’s supposed to be measuring. You really need to use an infrared thermometer to see the actual temperature of the solution (the liquid heats up way faster than what the internal sensor tells you). This particular machine is made in China.

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I use purple “simple green.” Empty gallon jug. Add 20oz of purple simple green and the rest water. Rinse off the parts afterwards. Cleans plastic parts really well.