I like mechanical, too. But took a chance and picked up the Barska Quick Access biometric a year ago and put in the upstairs closet. It's really just a biometric "safety cabinet" mounted to studs, but overall I'm satisfied with the purchase. I do recommend scanning multiple fingers, in case something causes interference with the scan (e.g. callus). It's been overall dependable and perhaps worth checking out, anyway.

But a prepared burglar w/ the right tools could open or walk out w/ it, given few minutes to spare.