Have only built Dark Debts, The Latigo Posse and the Guild's Judgment. Those weren't too bad, although Lady Justice turned out to be very, very fiddly. Still not as bad as some metal miniatures I handled. Privateer Press' Feora2 for example, or Corvus Belli's Chimaera.
Overall I really like working with plastics you just have to be very carefull what you cut of. Oh and use plastic glue (with a hollow needle), or you will have a bad day.