Product review (5 stars): Spend the extra for this!
I bought this wall cap and one from Broan at the same time for two projects around my home.  Nutone is a superior product.  The metal is thicker, the mesh wire doesn't come off, there pipe that comes off the back of the unit and there are six holes surrounding the device that make installation a snap and also makes the device tight and secure.

Pros:
Well built
6 installation holes
Permanent Mesh

Con:
2 small holes in the inner tubing that were easily covered with installation tape.