I am a LPN, in ADN school, and was a CNA first.
I work agency, and once in a while I will accept an assignment to do direct patient care, just to remind me of the wonderful help the CNAs are to me. Most of the CNAs I work with are the most concientious people I have ever worked with. They definitely know more about the patient's physical self than I do most of the time.
I find it very humbling to do patient care, and it always makes me appreciate the work they do, and it keeps me focused on all the work they do.
The CNA has much more opportunity to deal directly with the patient, and they are so knowlegable!
If you go that route, like every one else has said, it really makes you appreciate them all the more once you are an RN.
I know that I sure look at them differently, having been and still am in their shoes.
The work is physically challenging, but oh, SO rewarding.