Good post, but I have one minor nitpick. The fact that the BM is difficult to open with one hand (I've never had difficulty opening mine, but then I've never jumped in the lake to test it either <img src="images/graemlins/smile.gif" alt="" /> ) is not a liability when compared to a device that can't be used with one hand AT ALL.

The BM can be used with two hands; the SF can't be used with one. I think that deserves mention. <img src="images/graemlins/wink.gif" alt="" />