I have both lights mentioned and I can say I am a fan of both!
The rectangular shape of the E300s is indeed different and fits well in the pocket, despite being big! I modded mine and put some XPL-HD Leds to avoid the XP-G3 bad tint. However, I believe the Nichia version will suit those who like better tints.
As for the A5, use it daily in my keychain and has worked well since I received it :wink:
BTW, unless you have a battery issue, you don’t need to unscrew the back. Actually, I would advise not to do so, as the sealing rubber may get damaged when putting it back on place.

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