I wanted to get into making green smoothies in the morning and started researching many blenders.  I came across the Vitamix 750 and never looked back.  This is by far the best blender out there and works flawlessly.

Noise - I do not have anything to compare this to but to me it doesn't seem that loud.  For the power it has, I would say it should be louder so they did a good job here.

Tamper - Boy does this make a difference.  Once you use the tamper to ensure all your food gets blended, you will wonder how you lived without it.

Blending - Of course, the most important.  This blender has it's way with anything thrown at it.  The consistency of the end result is spot on and there are no pieces of anything remaining after it finishes.  I have only made smoothies so far with all types of vegetables and fruits.  I have yet to add seeds (like flax, hemp, chia) to see how it does but I am certain it will do the job!