Well... I wrote a very nice review of this helmet adding to that which was already posted by jfenton. Apparently I must have written too nice a review as the system logged me out (for inactivity) and lost the review when I logged back in. I am not going to re-write the entire review.. so to summarize:
Pros - Well ventilated, well constructed, quality fit and finish. CW-1 shield is taller and wider offering improved field of view. Q.R.S.A. (Quick Release Self-Adjusting) Base Plate System pulls the shield tight to the gasket when closed for improved weather seal. Pinlock system for CW-1 is improved and like the shield is higher and wider and no longer has the gap at the top. 5 Shell sizes for improved fit. Meets the new Snell M2010 standard.
Cons: Top vents are stiff and slick and are difficult to operate with a gloved hand. Helmet is generally quiet, but can whistle under the "right" conditions if you turn your head to lane check etc. Both small cons.
Summary: I would say this helmet is more evolutionary than revolutionary. If you are happy with your current lid by all means keep it, but if you are in the market for a new lid I would add the RF-1100 to the short list.