One thing not often mentioned is the ability to plumb the mopping system. That’s the main reason I’m continuing to stick to my S7 MaxV Ultra with the water change kit. I don’t have to refill the water and the dirty water automatically drains down the laundry room washing machine drain. I hope the S8 and other brands release similar kit because it changed my machine from a weekly maintenance burden (refilling the clean water and emptying the gross water every week if you have it mop nightly) to a monthly or several monthly chore. All I ever need to do is rinse the dirty water strainer and clean the hairballs off the ends of the rollers, and even then I can ignore it for months without consequence.