Just got my Protege today. It's a great device. My only gripe with the Protege is that it is an absolute PITA to screw the battery cap onto the Protege, especially with a protected battery. Here's a pic in my hand:
It is smaller than what you think it is.
Here's a pic comparing it to the size of other products:
From left to right, a 14500 battery, Vapre51 (or VP1), PS Protege, PS USBpass, The Chuck, M201, 510 with regular battery, and CaSH Cola 30ml bottle.

It is smaller than what you think it is.
Here's a pic comparing it to the size of other products:

From left to right, a 14500 battery, Vapre51 (or VP1), PS Protege, PS USBpass, The Chuck, M201, 510 with regular battery, and CaSH Cola 30ml bottle.