To kind of continue this Hydroclean thread, I purchased one a few weeks ago and have been very happy thus far. I used the pressure washer to clean our cars, the siding and even our patio. For the patio, I'd highly recommend getting a surface attachment as it cut the time down to 1/3 of the time. I purchased the Sun Joe attachment which is onsale on Amazon right now for $9.99 and confirm that it works with the include transfer adapter (Sun Joe Surface Washer attachment). I know this is the 1st instance for Roav/Anker putting out a pressure washer, but I'd recommend putting out something like the surface attachment as it's a huge time saver and everyone should add to their accessories.
My only major complaint would be the lack of nozzles as it only comes with the soap, 25 degree and 0. A 15 degree nozzle would be helpful to get a powerful spray with a wider radius as the 0 is powerful, but the spray is very contained and would take forever to clean large areas. I ended up having to purchase a nozzle pack from Amazon to supplement, the lack of a 15 degree and it was helpful in clean larger areas with a strong, but wider spray.
Here's a full review I left on Amazon (link)