Comment by sillystuff

I'll second the steep learning curve for the twiddler. I never got up to a typing speed on it that was not horribly, frustratingly, slow. But, I only needed it for a couple months.

Like OP's relative, I also could not use my dominant arm, nor have my arm in a position that would allow typing one handed on a regular keyboard. The twiddler was the only commercially available option that I was able to find that would allow me to type in this state. So, another recommendation of twiddler, but with the caveat that the original had several warts, and while they appear to be redesigned, they may still suffer from some of them.

The velcro strap to hold it to the hand, combined with the shape of the keyboard, allowed it to shift position while typing making it harder to use. Photos of the current models show they have a different shape now. Maybe this is less of a problem now? They are also wireless now, so there isn't a wire constantly pulling it out of position whenever you move.

The keyboard markings rubbed off completely after only a few weeks of use on my OG twiddler. Hopefully they have worked that manufacturing issue out for the current models.