As someone who had one of the earliest cochlear implants done back in the '90's, I would say it'd be a non-invasive surgery (with minimal recovery/rehab time, say, a week), with near infinite options of modding the software without touching the hardware again. It'd be easier to implant toddlers (and younger) given brain plasticity, but that's a whole 'nother ethical argument that medicine has been dealing with since back then.

We certainly do live in interesting times.