As I'm in the market in the near future for a tiny dishwasher, I can't help you much on huge models. However, if you happen to be in the market in the future, these have some of the better reviews I've seen on amazon--for the price and size it isn't awful seeming.
Three demographics seem to use this:
1. Tiny house/apartment people, obviously.
2. I've seen people that are bachelors say that this is actually quite sufficient for them despite its issues since they don't cook with multiple pots and pans everyday.
3. People who cook so much they even fill up their full sized dishes more frequently than they'd like. I've seen a lot of reviews of people saying this was great because they could have both running and they didn't have to wash those last few dishes by hand and saved water this way.
Bonus: You can use the clean rinse cycles to fill up a soaking bin for new dishes being made. Can't really do that with a full sized dishwasher, though I think it'd be a good idea to make them more water efficient--to have the pre-rinse cycles powered by a reservoir of the clean-rinse cycle water.
Just an option to keep alternatives in mind