best edging shoe out there
Very stiff shoe, fabric doesn't flex at all making a very powerful shoe.
It excels at hard vertical to slightly over hung routes that require precise edging.
If you size a little larger they would work well for long slab work, or long routes that you need to stand on an edge for a while.
I prefer a more sensitive shoe if there is much smearing involved.
They have hard rubber and don't work the best for hard overhung bouldering.
I would say the lack of sensitivity and the hardness of the rubber that make them excel with precise edging on hard routes...make them junk for bouldering period.
Make sure you get the right tool for the job.