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It fits snugly. It's fairly easy going in, and a lot harder coming out. That means it's secure so I like the fit, but it seems other reviewers here do not.
It also isn't capable of transferring data to your computer for whatever reason. Not like that's the end of the world anyway, just use an FTP. It you don't have CFW and can't use FTP, you really should have CFW, you're leaving so much of your Vita's potential untapped.