We had them at our church three or four years ago. As far as I could tell gulit was thier main message. Many in our church loved them, many (inculding me) were put off.
One thing sticks out in my mind, the leader, who had a teen age son, said that he would rather his son die than have pre marital sex. While I do not want one of my kids having premarital sex, I would not want them struck down, and think that that was the WRONG message for our youth.
We also have several women in leadership roles,though not ordained, as well as women attending seminary, they were told in no uncertain terms that they were in sin.
If this philosophy fits well with your church you will probably be blessed by having them come, if not I would stay away from them.