@dirb @dt the longer answer is that most Forths people have tried are those hosted within another OS. however, if you've ever tried a standalone Forth, or even one hosted on a Forth CPU, Forth's elegance bourne through brutal reductionism is simply breathtaking. in the words of one prominent Forth advocate, it's "Forth all the way down!", and it is true -- from the highest level of abstraction right down to the instruction set.
@dirb @dt I recommend it! in a related vein, the documentation of the GA144 might also make for fun reading, since this is still in production. http://www.greenarraychips.com/
There are also some nice videos to be found in the ArrayForth Institute part of GA's website which introduces the instruction set and using ArrayForth. ArrayForth(/colorForth) is a very unusual Forth.