I used it for years but when I got a replace t computer just never bothered changing keys around and stopped. It was neat and I typed reasonably faster but at the time many programs wouldn’t handle the mapping and I’d have to remap controls in every game and was just kind of annoying.
The single best part was the loom on people’s faces when they used it. They’d go to type, it wouldn’t do what they expect and then they’d look at the keys and then to me like I was an alien. So good.
There’s probably still at least one nutjob trying to solder an M4 onto an ATX board so they can stretch the meaning of hackintosh… and I for one salute them.