I'm looking for a full piece that stays on my head well, and looks natural around the edges if possible.

I've had a couple lace units. They have natural edges, but they aren't very secure and the hair doesn't look like it's coming out of my scalp. Has anyone tried a poly skin full piece? Does it really "vacuum" to the scalp like the Peggy Knight vacuum wigs? Do the edges look natural?

PS. I just received an iLace order, but it wasn't what I hoped for. I didn't know there would be a different lace (2"~3") around the edges. If I part the hair, I can see where the two types of laces connect. The only way it would work well is with bangs.