Crafty Games has nailed it with this one. The monk naturally serves as an excellent interpretation of the AD&D style monk, and builds naturally onto the Martial Artist base class. However, it also offers a number of options to diversify the archetype, based on the Vow chosen, and need not be strictly reserved for fist-and-foot chop socky heroes. The Vow mechanic was a brilliant move, a way of tying in their abilities to an austere way of life, while not overly punishing players for acting in reasonable ways. The Monk also expands the Path concept somewhat, offering a new way to gain Paths and showing off some more possibilities for abilities.
[5 of 5 Stars!]