I like the idea of a portable blender, but I'm not sure if it's a convenience. I was under the impression I could put all the ingredients in,  and then store in the fridge until I'm ready to blend. But it says you cannot refrigerate unit.  So if you don't have frozen ingredients,  I guess it would be ideal.  Although it does say not to store certain foods or liquids in unit for a long period of time ( what's considered a long period,  30min, or 3hrs? ). So pretty much the only convenience is that you don't need a power source to blend.  It does a good job blending,  and is very quiet. So that's the plus.