The shield exchange on the Arai Profile (LRS)is a snap once you get the hang of it. There are some good vids on youtube that can help with the learning process. Still, just like good riding techniques, nothing beats a little practice. Regarding the effectiveness of the dark Arai compared to the PinLock, I have to disagree with rockbottom. The PinLock is an insert, it does not, at least mine don't, cover the entire interior area of the shield. There is a 'boarder' between the outer edge of the PinLock and the rest of the shield that is the same color as the regular shield. If using a clear Arai outer with a colored PinLock, there will be an outer ring of clear. Now, is it noticeable? Yep. Do you get used to it? Yep. Will there be occasions when the sun might peak through? Yep. Will I ever not use a PinLock? Never.