I use the magnesium case (Magnum) from innopocket with my X50v. I ordered it few months ago directly from them, and it was delivered in a week to west coast US.
About 10 days ago, the belt clip of my Magnum case failed (was stuck at the locked position). I contacted them about the problem, and a replacement belt clip was in the mail the next day (again, took 1 week to get here from Hong Kong). Actually, when the package arrived, there were 2 belt clips in there

Just to share, in case someone has (or will have) a similar issue.
Good customer service!
Cheers!