It does what it is supposed to do. These are a super-convenient way to make a single drink to go. I can put my fixings in it, put the lid on, keep it in the fridge, blend right before I walk out the door and not have to clean the Vitamix, and then the cup actually fits in my truck's cup holder. I wipe the threads before I screw the top down and I keep them upright like a coffee cup, I don't toss them around but I have never had a leak. When I get home I fill the cup (through the drinking hole) about halfway with water and a squirt of soap  then close the lid again and shake it until the sided look pretty clean, then I open it and brush the inside with a brush and rinse. I run them through the dishwasher less often, they fit in the top rack angled toward the sidewall.