Yeah, I've heard some can be problematic. I think it's like anything else mechanical. They were very unreliable when first brought on to the market but have improved substantially since then. From what I can tell 9G Products makes one of the best though not the least expensive. They claim a failure rate of only 1 in 100,000.

And just to clarify...these aren't "safes". They're mostly designed to keep unauthorized people away from your gun and provide relatively quick access with a modest amount of security.

I've been thinking about THIS ONE.