First, let me say something about blenders in general. I have used a number of blenders over the years and while I now have the granddaddy of all blenders (my vitamix) I guarantee you there other blenders that are equally powerful and work equally well so don't think you have to go out and buy a $500 blender in order to make a good smoothie. I know people with the blendtec, the ninja and I previously owned a Breville blender which is an amazing piece of equipment for the price.
Second, the more frozen your fruit the more power you need. I normally put my fruit in the blender and let it set at room temperature for about an hour. I like the consistency this provides to the texture of the smoothie and it helps prevent dreaded brain freeze.
Pour your Pom liquid in and add your fruit then blend until smooth. If the smoothie is thicker than what you want, add a little water. Next, add your spinach, flax and agave or honey. Process until you reach the texture you want. You could also add some Greek or regular plain yogurt to this if you want a little protein. Sometimes I add 1/2 c of Fage which adds about 11g of protein.
I hope you enjoy. Happy living people!!