these would definitely merit 5 stars if the lids were made of stronger clear acrylic like the older versions.  the reinforcement structure on the underside of these thin black lids forms many cavities with hard to clean corners.  being difficult to clean is a big negative for an otherwise improved design.  the older versions had strong lids without the need for reinforcements, but they had a style of gasket that was prone to leaking and losing the vacuum.  with this better gasket style that rarely leaks, fixing the lid problem will rate 5 stars +.