I picked up one of the LidL ones which works adequately given its low power.
If I ever get more ambitious I shall get something much more serious, probably £200 or so range. I've been inside a low end import one that died after a very short time. It wasn't pretty. Too much emphasis on price and not enough on performance and engineering!
Interestingly the LidL instructions says not to use it on glasses. Presumably the ultrasonic cavitation forces are large enough to risk coating separation from the glass.
Certainly the one we had in the lab had a very strict list of what could be cleaned and what power settings to use But that was very old technology, separate power supply about as big as the cleaner, and silly powerful. Allegedly able to disintegrate thin aluminium sheet. A story I never cared to test. It was loud when operating.
Clive