We were really worried about purchasing this piece without seeing it in person, but it has been a fantastic addition.  We store our saddles/tack in it (we weren't able to build by our corral), so we really needed this to be watertight.  We've had it for a year now with no leaks.  It withstands wind and water and hasn't budged.  We live in California, so I don't know how it would stand up to snow, but it's been wonderful for our purposes.