I have 2 E2Es, a C2 and a G2.  I have an E2E and I bought one for my wife.  I have had it for a couple years and gone through about a dozen sets of batteries.  The bulb still works fine.  I have a spare but have not needed it.  I was carrying it between my pants and my belt.
Be aware that the new E2Es are sharp on the bulb end.  I’m not talking about the Defender.  It has a scalloped edge that is sharp.  Also, the knurling is very sharp and will wear holes in your clothes anywhere you clip the light.  For this reason I have gone to the C2 and put a piece of bike inner tube on the knurled end.  I would carry my G2 but I have not found a pocket clip for it.  When I do I will switch to the G2.
I think the G2 is better than the E2E.  But then I think the Glock is better than a 1911.
  
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