Wow! I mean WOW!!
I've always had cheap multi-button blenders in the past, and never thought much of it. It wasn't until I developed a motor neuron disease and could no longer chew effectively that I realized that the old blender wasn't going to cut it. 
The K400 chews through anything frozen in the blink of an eye. I've been making smoothies out of foods that I had no idea could be put in a blender.
The only thing that I should have done is to have bought it with a tamper included. 98% of the time a tamper isn't necessary, but the last 2% really needs one.