Here are the pix and my thoughts. I did receive the chin curtain and was able to try it out as well.
Sunshield - I get a headache with sunglasses inside my helmet after a while so having this is a worthwhile upgrade for $20. It's optically correct and operates independently of the clear shield. I did have to adjust the visor from full forward to about the middle of the adjustment range to clear the sunshield when it is up. Good upgrade in my opinion and you don't have to remember sunglasses or switch shields.
Chin Curtain - This does noticeably cut down the wind noise. It also makes taking your helmet on/off a bit of a pain. I finally found a technique that works so it will clear my nose. If you do a lot of helmet cam work - attaching an external mic to the inside front of this would be helpful. While it does work, if wind noise isn't bothering you it may not be worth spending $8 for this.