New Nike Vapor Iron Difficulty

Trying to get some information from a friend on the new Nike Vapor irons and saw the MPF ratings for all of the Vapors fall into the Player Classic category. Are these irons that difficult to hit?

URL of the MPF ratings:

http://www.golfworks.com/images/art/MPF_NIKE.pdf

http://www.golfworks.com/article.asp?ai=870&eid=IronMPF