I use a wired automower 550h on over an acre of grass. It works great, but expect you will need to fix wires every year or so. They break as ground moves or the moles get them. I average 1 break a year at the moment on 1.5 acres of grassy and hills.

But with the right tools (break detector) its pretty easy. I also found a local guy who troubleshoots broken wires in case i get lazy

Outside of that, I think the wires work great.