I have both the fly screen and the Roadster screen. I ride with the fly screen about 90% of the time and put the Roadster screen on during winter or long trips. I find the fly screen very effective at blocking the wind the chest area, stopping you from feeling like a parachute..
The two screens mount at the same point with four bolts, so it only takes about five minutes to switch between the two.
OH.. One note: The rear seat!! I take my children on ride pretty often and they both HATE the stock passenger seat. My daughter is only 8 and doesn't weigh anything, and she thinks it's like sitting on a board. I opted for Triumph's gel passenger seat , and gel "low rider" seat for me. If you take your daughter for rides, or any other passenger, a different seat is a MUST have.