I've got the non-Pro Z1 version. Have been using ~3 weeks. Going well for me, though a pretty straightforward 18'x40' rectangular with some stairs on one end. It's accurately mapped the pool, now avoids colliding with the two main drain bumps, and parks itself for 5 mins after it's done so you can retrieve it poolside if you're home. Otherwise, I've just used the hook to pull it out when it's done.
Won't say it's extraordinary but does look like a good replacement for a Polaris 280, for example. Would like to compare to the Beatbot Aquasense2 since that latter robot is a 2nd gen product (and Dreame Z1 is a 1st-gen).