Neutral item: the butt cheek panels. I guess it's supposed to prevent your butt from getting squashed. My butt is pretty flat so didn't make any difference.
Negative (for me) I really wish they had a cotton panel on the crotch. I wear light panty shields and they don't stick to the lighted ridged material the shaper is made of. Not a huge thing. More of a "wish they would..."
Judy from Denver, CO USA