This thing is great. I'm a huge protein drink/smoothie person and often make them as a form of dessert. If I'm in a hurry I'll even do it for lunch between meetings. Ninja products are fantastic no matter what, I've owned a handful of them before and love them so this is another one I love. 

The Blast is quieter than other blenders (we live in an apartment and try not to disturb the neighbors), and efficiently grinds what I need (although to really get a smooth and thick consistency you may need to grind it a few times but that's to be expected). It isn't really an issue to do so. 

The main use for me is actually to grind coffee beans because I DO own a larger blender to use for smoothies/protein drinks when I'm not "on the go." The Ninja Blast is perfect for fresh French press coffee when you don't own a coffee grinder. :) So if you need any other ideas for it there you go!