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The 'accidently unclipping' thing has happened to me, but only when the cleats are worn.

Plus, you have to be more conscience of keeping your feet straight and not letting them turn out too much, or you'll unclip. Happened to me once or twice, but only when climbing.
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the unclipping you mention was caused by worn cleats woldn't that happen on nay clip?
Kinda strange about your other comment seeing as Frogs have something like 35 or 37 degrees of float (rotation BEFORE your shoe can be unclipped) as opposed to a standard SPD mtn bike pedal of maybe 5 degrees.
The only thing I will say about frogs is that when you are clipping in it is not a positive clip in. You place the shoe on the pedal correctly and it's in, no snap, no nothing, just in. I like to feel a snap in so I know I'm clipped in for sure. That said, they are great and I like the float.