I already own a Soft Vault case, and was looking for an additional one for a new pair of sunglasses.  Thinking on getting something different, purchased the Metal Vault.

It has a fancy look, great finish and the sunglasses will fit perfectly.  Depending on which model you have, the glasses will feel a little loose inside, and you might hit them when you close the case if they are not positioned properly.  Also, if by any reason you seat on the case (like in you car for example) the case looses the form, and it will not close/open normally unless you try to mold the metal back to it's original position.

So, the are okay but personally I will stick to my Soft Vault for being more reliable and durable.