I have one of these!
So I got the Niagara over a year ago, to help cope with laundry during the pandemic. The laundry room in my building is ten floors down and surrounded by stinking garbage and recycling. No way am I washing my clothes down there. Disgusting.
I bought a cheap spin dryer first, but it was always out of balance, so I replaced it with the (slightly smaller) model from The Laundry Alternative. Unfortunately this forces me to usually run the Niagara slightly under capacity. On the plus side, that aids with rinsing and the clothes I think tend to get a bit cleaner.
My routine with this machine is to drop it and my spin dryer into my bathtub, so I don't have to worry about leaks or flooding. It's amazingly light for something so large - I have no trouble picking it up and plopping it in the tub. I set its feet and the spin dryer's on little foam feet to help isolate noise and vibration, and close the bathroom door while it's running. I actually have a compact soundbar in the bathroom, hooked up to an Amazon Echo Dot, and play a Spotify "Laundry" playlist while the machines are running to help cover the noise - lots of electronic music with deep grinding bass. My bathroom is right next to the front door and shares a wall with the hallway on one side and the vent shaft on the other, so it's important to disguise the noise as well as possible and this works great.
I run it thru a full cycle, remove the clothes, drop them in the spin dryer, partially refill the machine on the short wash cycle, then let it drain to remove soap residue and begin the rinse cycles over again. Once it refills for the rinse cycle I remove the clothes from the spin dryer and plop them in for another set of rinses, followed by a final trip thru the spin dryer and then off to a compact cheap tumble dryer I got off Amazon.
It's a hassle, but no more of a hassle than our nasty laundry room. And the machine paid for itself in weeks compared to taking my stuff to a local cleaners. During the pandemic I've been working from home and dressing light, so I don't do tons of laundry, meaning the extra work required isn't really that much of a burden.
The machine cleans well and doesn't make tons of noise, although I wish it were a bit quieter and had its own foam isolation between the machine and the skid pads. I get why they included a pump but I wish the machine also just allowed you to opt for gravity drain, since the pump is probably the noisiest thing about the machine. Unfortunately if you just throw the hose in the floor of the tub all the water drains out - there isn't a valve that closes it off while it's washing. So I have to use a bungee cord to hook the drain hose to a shower rack and keep it elevated above the water level in the tub. Another drawback is hose and cord storage - it doesn't really have any. I wish there were recesses in the back to hold the hoses and cord flush - they'd make it much easier to store the machine. The dimensions of the machine are OK, but I feel like it's actually both taller and deeper than it really needs to be and could be shaved down a bit. An option for separate hot and cold water inputs and internal mixing would probably be great too for people who have hookups.
My ideal machine would be a touch wider than this one, similar height but shallower, with the drum being a few inches greater in diameter. I think it would be easier to store for most people. It would be stealth - I'd make it look like a large laundry hamper with no visible controls or hoses - they'd be beneath the lid or concealed behind a panel in the back. It would have a valve to seal off the drain hose during wash and rinse, so you could just flop it into your tub or shower, with an option to turn off the pump and just gravity drain. It would have spin cycles, optional hot and cold water inputs w/mixing, and also feature clothes drying capabilities. Being able to replace three machines with one would be worth a lot of money to me - I'd easily pay $600 for such a gadget, probably more.
Here's hoping we see more of these horizontal axis washers in the US market. I can't understand why anybody would deal with the hassle of a front-load washer - all the gaskets, the stooping over, the mold issues, etc. - when this design is available.