"Entries for Qigong Institute members are color-highlighted"

Simply seems to mean they are "offical" members of the Qi Gong institute. You know yourself that this doesn't really mean much in the grander scheme of things (might be good, might not be so good).

Check out as many as you can and see how you feel after each session, and see how the teacher can help you.
"Let your food be your medicine, and your medicine be your food" Hippocrates.