I'm a member of Itten Dojo and I (from a purely unbiased perspective, of course) highly recommend the school for both its curriculum and its members. I think Ron Tisdale (whom, I unfortunately have not had the pleasure of meeting, as I was recently out-of-town for the John Stevens seminar) gave a good assessment and I must echo his advice to make arrangements to come watch a class.
The easiest way to do so is to send Bob Wolfe Sensei an email or call the dojo to arrange a mutually agreeable time to watch class. The website www.ittendojo.org
should contain both pieces of contact information.