IMHO it reinforces proper technique in a very novel way. For example, if I'm playing a chord near the "head" where I need to stretch a little for the chord form, my thumb will rotate towards the treble side of the neck. With the Endurneck, that angle and flat surface provide a much more precise anchor point than a rounded neck. The same happens in reverse when moving up to the higher frets where the offset trapezoid provides a great anchor point on the bass side of the neck. For everything else the flat back enforces proper middle thumb placement as if you're not in the correct position, you’re feeling the edge (though that has it's own odd benefits as well). Now, as I mentioned...this really only works if you're someone who's already more comfortable wearing their guitar a bit higher than "rock star" levels for ergonomic purposes as I imagine the neck would feel like garbage if slinging a guitar down at one's waist and completely pointless for someone who does a lot of thumb over the neck style playing.