I have been using them since I stared wearing over 10 years ago. Without them I can't even wear a system. I mean everyones needs and hair line is different.. They work very well for me. For me personally I like to get them low density. Easier for me to blend in.. I cut my hair usually very short on the sides in a fade.. at the shortest I cut it with a number 1 guard.. So i have to cut the hair in the flaps pretty short..

I have posted pics of my flaps quite a few times on here.