Personally I like the versatility that the straps add to the style of the watch. I just got into this whole NATO craze, and I really dig it. Also, as everyone else has mentioned, VERY comfortable straps. They've been especially good during these extremely humid summer months that I've been seeing.
It's like a whole new watch, and since I'm really paranoid/OCD about scratching up the bracelet and clasp, this saves me from having to endure those worries.