I've yet to have an eLeaf / iStick product make it a year... most have died within 6-months or less... usually it is a battery failure (failure to charge, failure to hold a charge, circuitry problems), or outright hardware failure, usually with the buttons. After my 6th one, I finally learned my lesson and went back to 18650 mods... and won't buy eLeaf products anymore
Oddly enough... I recently ran into the person I gifted my MVP 2.0 (purchased in April 2014), and she said it is still working (she gave it to her mother)... No, it doesn't last all day like it use to... but it still WORKS!