I haven’t had experience, but did get nervous after reading about them elsewhere. I had a rental booked through Hertz for later in the month at MCO, but read some horror stories so decided against it. I’m paying maybe $80 more, but I’m ok with that for peace of mind.
It’s not even the issue of the scanners, as I’m sure everyone will be using them sooner or later. It’s the fact that a lot of stories I read where you have a hard time contacting someone about it (even with pictures of your own to prove). Saying the chat box doesn’t work, calling is automated, and not hearing back after emailing pictures. Not sure if any of this is true, just what I read about it.