I've had them for several months now, and love them! I used to throw out a shameful amount of lettuce, grapes, and bananas, but now they stay fresh way past the time we use them up. You do have to make sure to wipe out excess moisture though. Interesting tip about the ziplocks though. I may run an experiment, put bananas in each & see which one lasts longer.
I'll let you all know how that works out!