We have a 2005.5 Montana 3400RL and are extremely happy with it. Tow with a 2005 Dodge Ram 3500 Quad Cab Cummins diesel. For a full discussion of this model (good and bad) and all other Montana models, the place to go is the Montana Owners Club (MOC) Forum
http://montanaadministrator.forumco.com/default.asp
Especially check for posts by "richfaa" who, after spending spent several years investigating various RV options and has ordered a new 3400RL. Few people know more about the unit and few are more critical.
Bill