i don't have one yet, but I've drank smoothies made from a nutribullet Rx, and they are 100% smooth after 30 seconds of blending. My blender I blend for 3 minutes and there is still chunks, seeds, etc. I've dried making almond milk with my blender and it does such a poor after trying to crush the almonds for 5 minutes that half the almonds can't make it through the nutbag still. I've tried grinding coffee beans with my blender and it sucks.
Although I haven't tried those things (other than the smoothie) with a "Cadillac Blender" from what I hear they work great. Also allowing almond butter, ice cream, hot soup etc. Also not breaking, and if for some reason they do, having a warranty to replace them that lasts more than 1-2 years.