I have a Kensington Wireless Desktop (I'm not sure if it's the PilotBoard, but I don't think so) and it's great, except for the occasional slip up on which key is sent to the computer. Sometimes it will send the same signal the sleep key does when I do a quick copy/paste with Apple-C, Apple-V. It also sticks on one key, but I think something may have gotten in there, so that may not be the keyboard. It's good overall, and I like the battery charging system it comes with (one set charging in the transmitter/receiver while the other sets are in use).
Kensington's other products are probably better, like the StudioMouse Wireless, but I love our setup.
jW