Comment Not just for professionals... (Score 5, Informative) 164
As an avid amateur photographer I once tried lower-end, slower SD cards. The wait between shots of ~1 second (disregarding the camera buffer) means you cannot even preview your shots during that time. Instead you get to wait with a nice blinking LED on the back of the camera until the preview is ready. I found this nearly unbearable after only a dozen or so shots and when I got a chance I immediately spent the money on a faster card that allows previews basically immediately. NOTE: I am using a D800, so your mileage may vary on this... with 36mp RAW files I was waiting several seconds to just preview a shot.