Great little device!
I am impressed by the power and the ease of programming available with this little device. FORTH had been created with small-footprint, low-resource applications in mind, and this is a very good implementation. The device is responsive, I haven't managed to find a problem with the implementation of FORTH (well, and even if one of the words I remember or need is absent, FORTH does let you define it yourself). The availability of the source code is yet another huge plus of course, as is the ability to build a "turnkey" system.
Somewhere on the Udamonic Web site I managed to find, only once, and I have not been able to find it again, a mention of an even smaller FORTH "engine" for more dedicated applications (something easier to incorporate on a PCB). Maybe he will be kind enough to point me to the specific URL again?
On more mundane matters: the devices were carefully packaged, one could almost imagine by loving hands... All in all, a great investment, especially if you are a nostalgic ex-user of FORTH.