I have been using the twister jar for a few years now.  It does a good job but not like the wildside jar.  The full wildside jar is too big to do just one smoothie, but it does a much better job when you want extra smooth smoothies.  The seeds and grains I use in my smoothies don't have the option to just spin.  They slam against the square sides of the mini wildside jar, not allowing them just spin unhindered, and this causes them to become smooth and blend quicker into the fruit, yogurt and other things I put into my smoothies.  This is a great jar that works exceptionally well.  I wish I would have bought one much sooner.  It is the perfect size.