I've studied at Master Pierce's for several years, and I really enjoy it.
I haven't been at the Lynwood location in quite some time, because I've been attending classes at a Marysville branch which is unfortunately closing at the end of this month.
Master Pierce is a Seventh-Dan blackbelt, and he really knows his stuff. It's impressive to watch him demonstrate a technique or form. All of the instructors are excellent, and there's a strong feeling of community at the school. Everyone is encouraged to progress at his/her own pace, and respect for instructors and fellow students is considered a must.
I'd have given Master Pierce's a Four-Star rating except that he strongly emphasizes attendance at tournaments, which isn't something that interests me.