The biggest problem I had with the Photon is the high risk of the button getting pushed - and the light turned on - while it is packed in the PSP.

Doug gave a procedure for putting his Photon into a demo mode (though that link to how to put it back in demo mode on http://www.equipped.org/dr_photon.htm appears to have died ... it told the user turn demo mode on by pressing the power button while inserting the batteries), which made it turn off after a given time.

The Photon demo mode is kind of a pain, plus a big risk of not working as expected when under a high-stress condition. This would include not realizing its in demo mode and/or not remembering how to take it out of demo mode.