26 of 27 people found the following review helpful
Good dishes, but bowl rims may chip & break easily,
This review is from: Pyrex Storage Plus 20 Piece Container Set (Kitchen)PROS: Overall I am happy with these dishes. The round plastic lids seal very well. They are snug, but not exactly water tight. The square lids do not seal as well along the sides but do stay on. Being made of tempered glass, the dishes can be used in the microwave, oven, fridge and freezer. They are heavier than thin plastic containers for taking food to work, but you avoid most of the plastic leeching that happens with those containers. The lids can leech plastic if left on loose during reheating due to the condensation that collects on them. Except for the bowl rims (see "CONS" below), these are fairly durable dishes.
CONS: The major down side to these are the glass rims of the round bowls. They are the weak spot and can easily chip or break. STACKING the bowls with out their lids on is NOT advised. This is especially true for the smaller "2-cup" size bowls. Due to the crystalline nature of glass and very little tapered angle (the sides are almost vertical), pulling 2 bowls apart can shear off pieces of glass from the rim of the bottom bowl. You may not be aware of this when it happens and there is a danger that small shards of glass may be left inside a bowl. Those of you with children should be aware if this point. The square dishes do not appear to have the stacking problem.
When using a dishwasher, you must be careful to NOT allow the rim of one bowl to come in contact with another dish. Otherwise the water pressure may rock the bowl back and forth resulting in impact damage and chips to the rim. I suggest trying to move or wiggle the bowls by hand to check the range of motion while resting on your dishwasher's rack. With a little experimentation, you can find the right spots to load these bowls safely. This is mostly a problem when the bowls are at an angle. The best way to load them seems to be securely on their side. Just be sure they cannot move around and are not tipped back (which will trap water and soap).
Pyrex appears to change their manufacturing frequently, which one assumes is to improve the product. The color of their glassware has a darker blue-green tint than they did a few years back. The rim (lip) of their dishes have a more rounded edge than before. However, the issues I describe above are still present. It should be noted that the rim weakness usually only results in small chips and I have not yet had a "fault line" or deep crack start in one with normal use. With over 2 dozen of the 2-cup size bowls I have only had one casualty when it was dropped from about waist height onto a very hard floor.