The base of the glass jar stopped locking in place within three weeks of light use. The base would also easily get stuck inside the blender, meaning you would essentially be unscrewing it from the glass jar, dumping the contents all over. Terrible product.
The design is baffling, to secure the blade assembly to the jar you turn it clockwise. To secure the jar to the motor unit you also turn clockwise. Then to remove the jar, you have to turn it counterclockwise, which also loosens the jar from the base! I've spilled soup all over because it came loose, blade part stayed with base, jar came up. Throwing it away, so frustrating because it worked well otherwise.