lid/blade rarely screws on properly, resulting in constant leakage from the cup and a mess on the counter. The leaking has also resulted in the sticking of the 3 buttons that need to be pressed down by the cup in order for the bullet to work. I often have to wet the 3 buttons with a sponge so they can actually be pressed down with the cup. I don't know if there is an issue with the lid or a problem with the design, however, I know i take great care of my things (i.e. i hand wash the lid/blade and attachment cups) and I only use the product 3-4 times a week, so I know the issue isn't something I caused or normal wear and tear. These issues are very annoying and make me not want to bother using the product.
So far, so good. I use this daily and it is delicious. I like the recipes included in the box. Turns fruits and vegetables into a delicious, healthy meal. The NutriBullet runs very well without any sign of strain or overloading.