Review (5/5): I love them.
I got a curl setting product to work with the twist flex rods and now get pretty curls that relax during the day. I put the curler by my scalp and wrap the hair around it then finish by putting the hair ends toward my scalp and turn the curler with hair closer to my scalp, made a loop of the twist flex (one half over the other) then bent that loop forward over the curls then brought the twist ends around the hair & loop to make a tight knot by my scalp. Try to get them toward the top of my head in front & sides so I can sleep without laying on a curler. I like the red in front, pink in the top back, and green ones I use along my neck line. My hair is still damp in places after 7 hours (I sleep in front of a box fan) so I just take them out and don't do anything with the curls until they dry completely then pull on the curls some. The curls last all day. I wash my hair every night but I have a feeling the curls could last longer.
Update: I now use no setting product just the rods. I use the green ones all over my head. I put the hair around the twist flex same way as before wrapping the hair around the whole twist flex rod then bend it in half putting the one half under the other, twist the ends together. So much easier and next day my hair is so loose and bouncy. I learned on tv yesterday to leave about 3 inches loose for the crimped style or double crimped style for a more relax style, so won't worry so much if the ends aren't twisted in.