I bought a 3-pack of LED flashlights at Costco last fall.  They are very bright (which is welcome for walking, and cleaning up after, three big dogs in the dark).  I keep one in my coat pocket, one in the leash bucket, and one near the door.  The switch is a button on the end which goes from off to very bright to VERY BRIGHT to flashing.

Within two weeks the switch on first light I had pulled out had already started to get flaky, and two weeks after that it was useless enough that I tossed it.

That said, the other lights have been very reliable and have lasted through the winter without a hitch (and in fact I picked up another 3-pack before they were all gone).

FWIW I also have an LED Lenser which I keep at my bedside table.  Don't use it often but it has always been perfectly reliable.  It cost more than that 3-pack did, but I expect there is better consistency in the units, and heavier duty cycle switches.  Especially in the cheap LED lights you see ($3.99 at the Office Depot checkout line) the switches are the weakest link.

Which do you think, NOP or IEFBR14?