Both my neighbor and I installed this mailbox and I have to say it's been great. We made our own stand and platform from some scrap and a few 4x4 posts. So far the mail is safe and dry in rainy Seattle. 

I would say it's rather important to pour a decent concrete footing and build a study platform. It took a few extra hours but it's worth it. The mailbox is large and heavy so a solid support is necessary. We bolted up through our platform into the box so the nuts securing the box would be out of reach for a desperate mail thief.

Outgoing mail has a clip on the inside of the magnetic opening lid. It feels a little flimsy.