I really like using this little blender for making my chia/flax seed smoothie and then taking it with me.  It is just so simple to use -- not a lot of buttons and hype -- just fill it with your mix and push the button.  It's that easy. 
One thing though, you need to be careful to secure the top and hold it while mixing.  The second time I used it, I held it from the side and the contents pushed out the top and all over my shirt.  
But other than that, it works really well and does what it's suppose to do -- mix my drink.