I have the datadesk smartboard about 2006-8 or so . Too big for my current setup (and I’m too lazy to get a PS2/usb adapter).
Took me a month to break myself of my normal typing habits to be able to use this one which claimed that I would type faster.
My max was 110wpm at 99% accuracy. Did it work?
It did. It got me up to 118 wpm and it was comfortable.
But I did a lot of typing away from that keyboard and it was more important for me to have my regular touch typing habit intact, so after a couple of years, I put it away and went back to regular keyboards. I had to retrain myself to get my speed back up again on the regular ones.