Juicing Carrots - good for you or not?

Hello all,

I have always believed that juicing carrots is very very good for you - and this has been substantiated by many of you on this site as well as numerous articles etc. that I have read and researched. However, I just stumbled upon this site:

http://www.mercola.com/nutritionplan/juicing.htm#

This guy says carrot juice and beet juice in not good for you?

Would love your comments on this.........