I actually just put my stock screen back on my '06 yesterday. I took my Puig double bubble off because it needs to be replaced, but I was amazed on my 300+ mile ride today at how much better the stock screen is! The wind it so much smoother and doesn't smack me right in the faceshield anymore.
I like the looks of the dark smoke screen, however, so I'm planning on getting the "standard" Puig dark smoke screen. I only rode about the first 100 miles that I had the bike with the stock screen and then put the double bubble on, so I had no idea what I was missing!