The Wildside has 5 sides. The handle is on one 'corner' except this 'corner' is a flat area, too. I guess that's what makes it wild? The 'normal' jar is more like a square when looked at from above. I use the wildside jar to make smoothies and whole juices. The theory is that squarer jars have 4 slow zones in the corners, like a place in the river where the water swirls and slows down. The wildside reduces this eddy effect, making it better for thicker juices and smoothies. They also have the Twister jar, which appears rounder, to be used for really thick jobs like nut butters. Hope this helps.
I learned to ignore the noise quickly. The darn thing works so well it is worth enduring the assailing sound! This thing blends the pit of an avocado in my dialy smoothie. I use various cycles, but the pulse button is my go to. Congrats on purchasing the best blender available!