| Customer Reviews: Average Rating:  Rating : - Great product idea, 1 bad design flaw Well, Oster made this product line to be compatible with most of its blenders. That's all fine and dandy, and it works with all my protein shakes. The problem is, the blender SOUNDS different when I use this cup rather than the glass blender pitcher. It sounds as if it's struggling and "smells like burning." I can't for the life of me figure out why. It isn't getting stuck on anything, as I tried putting water in the cup and watching the blades spin. Also, when you screw the blade onto the cup, liquid can seep out from the bottom without its rubber gasket (which is easily losable in the dish washer). Milky protein shakes get pretty nasty when not cleaned up, so make sure you RINSE this cup after using, because crap just loves to stick to the inside after drying. However, it is a good idea and it works most of the time, I'm just worried my blender will explode one day while using it. + See Full Customer Review |  |