I have used these cups for about two years and they are far better than other measuring cups because you can measure the amount from the top while filling. You don’t need to stop and look from the side. This is achieved via a patented angled surface with clearly marked volume indicators. It is a simple, unique, improvement to something I use all the time!
[As several commenters have pointed out, Pyrex recently released a
borosilicate tempered glass measuring cup similar to the OXO one above available at Amazon for $19 that may be better suited for the microwave. ]