Fwiw, I owned an original design AudioDeskSysteme (ADS) unit that worked without problems for ~5 years before I sold it. Keep in mind that ADS (R Gläss) was the pioneer in vertical single record desktop cleaners and alone in the market place for many years. He took a few arrows as he worked the kinks out of the machine. Having proved the viability of the concept, followers hoping to build a better mousetrap inevitably arrived. Competition is good.
The ADS is not quite the same type of cleaner as the KLaudio or Degritter because it is not primarily or solely an ultrasonic cleaner. ADS is a hybrid that uses rotating brushes plus an ultrasonic transducer plus surfactant to clean a record. Neither KLA or Degritter has brushes and KLA does not allow surfactant. Each has its own specs for ultrasonic cavitation: time, frequency, power, temperature etc, with the end user allowed to control time. Each operates under a single frequency. All three share an internal fan as a design feature.
All three offer some degree of water/solution filtering. The ADS filter is passive - water washes through it without a pump. The 'standard' KLA model does not appear to include a filter. However there is a KLaudio model that does not have an internal reservoir that includes a filter - at first blush their Web site seems lacking information on exactly what is included or the working topology of this model - if there are owners out there, please say more. The Degritter includes a small active filter with a pump that operates during the cleaning cycle. The filter of each model is replaceable; the ADS filter can be cleaned and re-used. None of the companies state the rating of the filter, ie what size particles the filter traps and whether that is an absolute or nominal rating.
The Degritter and the one KLaudio model include a water reservoir separate or separable from the cleaing unit. This is worth noting as it may allow the end user to monitor water cleanliness in terms of dissolved solids and gauge the effectiveness of the unit's filter. Remember, the state of the water will be the state of the water on the record when it is dried; any dirt in the water on the record will be left on the record. The KLaudio unit with internal reservoir has a port that allows (some?) access to clean it. The ADS unit allows removal of its brushes, which can be run through a washing machine to renew them - rinse thoroughly.
None of these desktop units allow for easy access to their internal cleaning tanks which makes them difficult to inspect and clean. The tanks can accumulate dirt/sludge over time and should be washed and flushed out reqularly to the extent possible.
The Audio Desk Systeme and KLaudio units each include a 2 year warranty. I saw no information about warranty on the Degritter Web site. Hopefully their sales person monitoring this thread will tell us.
All these machines are primarily about convenience in cleaning a single record. Each has its own set of features to differentiate itself from its competitors. I'm confident that, when new, each will leave a record cleaner than it was before cleaning. Advances in record cleaning and active use of record cleaners help preserve the world's vinyl library and encourage further adoption of the analog format - that's a good thing!