It’s been a few years since I last read it, but from what I recall the devices themselves can be pretty much the same, but it might vary where exactly they “plug in”. Also each individual user will have to learn how to use the device. That knowledge gap is supposed to decrease as the technology improves.
Initially it will be used to improve the lives of people with disabilities, but eventually it will be used for direct communication and beyond. For starters, it took me a few minutes to type out this response on my phone, being bottlenecked by my fingers and SwiftKeys insistence that I meant different words. If I could just “think” the words directly into the input fortis field, it would have been much faster.