I've tried similar devices at a research centre for accessibility, although they also included motion sensors to transfer all keyboard and mouse functions to one hand (for ppl who lack a hand/arm). The motion part was horrible, but after replacing gestures with eye-following lasers the interface worked great. You simply looked and clicked.
Having touchpoints on your finger joints is actually very intuitive, it feels like you have four layers of three keys, and then a bunch more in your palm. You can also use the thumb-joint for right-clicks on the fingers. I don't know if the Peregrine works the same way, but really there are only so many ways you can touch your joints on the same hand. 30 keys on the Peregrine would mean you can touch the side of you index finger by the lowest joint as well (but reaching with the alternate would be very difficult), the device I tried had 29.
At a lower price, I'd consider getting one. Although you would have to customize all your UIs heavily. That means not-Windows (or some serious development effort from a windows programmer) and restricted gaming. Since I'm an "expert" Linux/BSD user that's not a problem for me, but I have doubts on the general usability of this kind of device on current software.
Besides, it looks more like something out of of Lawnmower Man than made by Nintenfluke@90s (alb. being from 89 -- more than 20 years too early it seems).