My initial review of the MX8 was positive. After a year, given the available choices, I would buy another.
One reason is that they neglect to include an important fitting to attach the suction line into the pool wall. I was determined that they had enough of my money for this expensive cleaner and made do with a soft Hayward fitting that I pushed into the hall that would secure the suction hose. None of what comes standard fit my suction line.
Another reason is the weird hose coupling design. It's nonstandard and I've had one of them break already. Luckily I have an extra length of hose, but am hoping to find an adapter so I can use the standard hose left from my previous cleaner, a Hayward Navigator.
And finally, despite a brilliant design, I think the propulsion units are flimsy. I needed to replace both in barely a year of use. The pool store guy told me that the most common reason for these to fail was too much suction, but that is not my problem. I need to throttle back my skimmer almost to the point where the pump begins to cavitate to get the recommended level of suction.
Also, they have no product support. I emailed them AND used the form on their web site and never received any reply. The YouTube videos are helpful, but I really bristle when polite concise inquiries are ignored.
Just my .02.