First of all... welcome and congratulations on investing in you health with the purchase of a Vitamix!
If you have made smoothies with raspberries in it in a common kitchen blender you will be pleasantly surprised upon making one in a Vitamix.
Most people have no idea there are seeds in it. To a refined palette it is possible to notice a minor texture but it by no means feels like a seed. If your smoothie contains other hard texture/roughage ingredients (like chia seed, dried goji, pears...) any raspberries seeds will be completely unnoticed.
One way to reduce any hint of seed texture even more is to make your blend with frozen raspberries and blend with minimal liquid.
Enjoy your Vitamix!