I have both, and have relegated the 3 to my PSK with batteries inverted against each other and not in the 3. While I loved the quick change for batteries, the press switch kept getting activated by keys on the same ring in my pocket. Result - When I needed it, I had a very cool light with flat batteries. I've gone back to carrying a 2 on my keyring for everyday.<br><br>Just keep a tiny screwdriver accessable for when you need to change the batteries. If only Photon would make a 2 with the battery change of the 3, or make the full on switch more idiot proof.<br><br>Peanut