Have used both straight and crimped Angelina fibers. I have a rhapsody quilt in my profile that most of the applique is bonded Angelina.
Couple things I have discovered working with them.
Both crimped and straight hold together after heat bonding, but it is a delicate bond that can 'unhold' if too much handling happens to the quilt. This make them best for quilts which will not get alot of handling (i.e. wall quilts)
I fuse mine between sheets of tracing paper. The reason I do this is;
1. I can see the size and shape of my patch (in case it 'smooshes' the wrong size during bonding with heat.
2. The colors of the fibers are heat sensitive and will lose or change color if over heated, so I want my heat to hit and fuse them quickly and not linger.
I experimented with extra bonding agent (steam a steam) in the mix and did not like the outcome...changed the interference color response.
I love how Angelina catches the light and reflects the interference color when the light source changes. It is like you get two quilts for one.