Thanks.

For me I can only use poly sides. My body chemistry breaks down glue very rapidly into a gummy mess. If I had all lace then the glue would be everywhere in my hair from the pressure from sleeping which would cause it to bleed through the lace. This isn't a problem with the front as I don't sleep face down in a pillow. And the poly holds better than lace when you're really active and sweat a lot.

As long as you get the glue to the very edge and get it lined up right against where your natural hair starts you're only going to be able to feel the edge if you're pressing your fingers right against the edge. I still have some of my natural hair that isn't buzzed down. About half an inch and I've become really good at blending with scissors so it comes out spot on.

I've been wearing for 2 years and a couple months. I've never been busted ever but I'm pretty obsessive at checking to make sure that everything is blended and invisible before I leave the house every time. And I've had plenty of girls run their hands through the back of my hair. No reaction from them ever. Now it's easily conceivable that they may have felt it and never said anything or reacted but I'm pretty sure they haven't felt anything out of the ordinary.