I have made them in a regular cheap blender. It does take a while for it to get the stuff to chop. Next time I think I will start blending the banana and water before adding stuff in slowly.
They worked out fine eventually though.
I use a regular blender too...usually ground hand full total of a soft nut (like pecans) and seeds then add the juice/water, banana, other piece of fruit then the greens on top. Haven't had any trouble if I add the ingredients in this order.