I bought a Frankford Arsenal tumbler so long ago I think it may have still been almost a government product. I use it at least twice a week and it keeps going and going. I thought it had finally crapped out on me a couple of months ago, but I smacked it on the side and it woke up and has not threatened to stop again. Seriously, the thing is like old enough to vote......
"If the enemy is in range, so are you." - Infantry Journal