I have the Bluebird model. Pulls good plugs, but only 18" or so wide and will work you to death. My next one will be a Plugr by Rock Solid. Definetely check into these. The Classen will be my next choice for a pull behind. I have a Turfvent now and am not happy with it.
I used a BlueBird and it did a good job but was horrible to manuever. Back was sore for two days. Maybe it was old, although it looked recent, but you had to pick it up to make EVERY turn! Won't be going that route again.