I've been to St. Anthony's and I enjoyed the experience. As with a lot of things, the truth about the Ephraimite monasteries is somewhere in the middle. With that in mind, here are a few of my own observations:
1. At St. Anthony's, they emphasize some of the "harder," more controversial aspects of Orthodoxy. They are outspoken about the "evils" of believing in evolution, and they employ ekonomia less frequently with their spiritual sons and daughters than is found in the secular world.
2. A lot of the "regulars" are zealot or fanatic personality types that I must unfortunately confess are similar to many of the individuals I have known who are attracted to cults. That said, I don't see this fanaticism among the monks themselves.
3. My priest has a lot of reservations about the monastery, and recommends that those of us in Utah visit St. Michael's in New Mexico or All Saints in Washington (he isn't OCA, though). He especially recommends that his parishioners do not go to confession there. From what I have heard, though, most of the monks at St. Anthony's recommend the same thing.