I now have 8 of these AAAs, one in titanium, one in brass and six in copper, so far I have only once had a problem with an e-switch that no longer worked. All the others have been working without problems for over two years and I use a different tool every day as my daily companion. By the way, 6 of the flashlights are converted to other LEDs, so I am spoilt for choice concerning the light color every day :-)
As a replacement for the defective e-switch I wrote to Lumintop and got there for $5 a Tool Ti Tailcap as replacement, the conversion to the Copper Tailcap was absolutely simple.
As you can see I am a big fan of these small flashlights because they are easy to handle, have enough brightness, the Eneloop batteries last very long, the flashlights are very solid and they look very noble.