I ordered the Q Revo with Prime Day discount last week and I'm so happy with it. It replaces my aging Roomba i7+ and Brave jet m6.
Probably the biggest difference I noticed is how much better the LIDAR mapping works compares to the VSLAM on the iRobots. If I remember correctly, my floor plan of like 900 square feet took over an hour to map with the iRobots and then it would still get confused if it was too dark. Compare that to the Roborock that only took like 10 minutes to map the same thing.
As for cleaning, the vacuum performance on carpet seems about the same and obviously the spinning mops are way better than the spray and push of the Braava.
And obviously having the water tanks and mop washing in the dock is just the cherry on top. Manually changing the pad and refilling the track of the Braava every time was kind of annoying.