WHILE SECURING THE EVENFLO COMET BOOSTER CAR SEAT, THE STYROFOAM BETWEEN THE SEAT AND THE BACK BROKE. MY TWO-YEAR-OLD DAUGHTER IS ABLE TO SLIDE THE HARNESS CLIP DOWN AND WIGGLE HER ARMS OUT OF THE HARNESS, EVEN THOUGH IT IS SNUG ACCORDING TO THE INSTRUCTIONS. BOTH MY TWO-YEAR-OLD AND I HAVE SCRATCHED OURSELVES, EVEN LACERATING THE SKIN RESULTING IN BLEEDING, ON THE SHOULDER STRAP POSITIONER BECAUSE THE PLASTIC EDGES ARE SO SHARP. MY TWO-YEAR-OLD DAUGHTER HAS BRUISED THE BACKS OF HER THIGHS AND HER BOTTOM ON THE HARNESS ADUSTMENT KNOB WHILE GETTING OUT OF THE SEAT.