Slightly off subject and a bit late, I bought a used Ryobi 80v 30" ZT (joystick control).
I have just over 7 acres, of which probably 5.5 need mowing. There are a few slopes that are steep enough that I do not go sideways on, and the ground is rough and grows a lot of rocks. I replaced the turf-friendly tires with tractor-tread style ones, I don't get stuck nearly as much and have a bit less mowing to do due to the divots the tires make sometimes. I've gotten quite proficient with the joystick, makes maneuvering easy.
While I'd like to get some of the other mowers I've seen referenced here, budget is an issue. I got a great deal on the Ryobi (used), although I had to buy 1 80v "suitcase" battery and a 12ah 40v battery to fill in the empty slots and get maximum range. I bought genuine batteries from reputable sellers on eBay, for much less than list price.The 40v 12ah died in storage over the winter, as it had a few weak cells, and I didn't charge them all winter. Lesson learned. I bought another 40v 12ah battery on eBay, with all the original packaging in case it goes bad and I need to warranty it. I also bought an empty power bank from Aliexpress, to put some of the dead pack's good 21700 Lipo cells into, so as to get some use of them. It's a beast of a power bank now!
My experience with the mower: no suspension, it beats the snot out of me on the rough ground, so I never use its max speed. In turn, I beat the snot out of it in what I ask it to mow, and where I take it on the property. It's held up well considering what I do with it. I cannot mow the whole area on a single charge, it usually takes several or more if the grass and weeds are tall and thick. By the time the batteries are exhausted, so am I. I have solar installed so charging it cost me nothing. "the Sun grows it and mows it." I don't bag or mulch, just side discharge. Gotta keep nutrients for next year's crop of weeds!
When the mower encounters a rock or stick too large, the blades just shut off, and I switch them off then back on to restart them. Never bent a blade, nor broke a hub on it yet while mowing; I broke the center out of a hub by carelessly tightening it while it was not aligned with the flats on the motor shaft after sharpening the blades and cleaning the deck underside. Replacements were under $20 but I had to do my homework to find the proper hubs, as there are similar ones that would not fit correctly but look the same. Not a whole lot of customer support available.
Overall, I am surprised at what this little beast can do, and if the batteries last over the years then I will give it a high rating.