My husband got his CNA training through BEST and while their prices aren't too bad (considering his training was paid for by the state so therefore free to us !!), their instruction left alot to be desired. Sometimes he'd tell me things that he was taught there and my hair would stand up on end!
Bonnie, one of the instructors, always had her husband coming in and out of the classroom which was really disturbing.
Also, don't expect the cream of the crop to take these classes with you. I took my CNA classes and I think I was the only person there who graduated high school AND could read. It was troubling to think that the people I shared classroom space with would soon be dealing with the elderly and infirm. Because your classmates aren't the brightest in the world, you can expect to be given an hour to read a 3-paragraph reading assignment. Bring a book, or something, to fill your spare time.