After several years of carrying a launch-week EO1 from 2009, it finally simply died after a couple years of constantly coming apart on my keychain even with a swivel loop attached. Talking to Fenix, their warranty won't cover it but they offered me 35% off any light from their store. Needing a keychain light, the EO5 seems like the likely candidate as I simply do not trust another E01 even at their current price of $7. Does anyone have issues or experience with the E05? Does the head twist off in the pocket? Any longevity issues?