This subject pops up from time to time. Over on the "other site" they have been discussed. Here are some highlights:
They tend to be noisier than most washing machines
They are good to use for those with septic systems
They use such little power you can run one off of an inverter. which makes them good for motor homes, etc.
They use more water than a front loader, but still far less than a top loader.
With a few exceptions, most people that have them like them. They are used quite a bit on ships in the Navy. So they are quite well built.