Would be a mistake to over look them! There are some very good players who do not play premier for reasons other than skill. A team of nothing but challenge (or NC classic) club players from one end of the bench to the other will be a challenge for a program with a few premier players and a mix of non club/ club players. Depth is an issue that can be coached against. Still a few great players can push a team by making everyone around them look better. There is also somthing to be said for the effect of practicing every day with players who test your skills.