I've had mine since Friday, and have refilled daily (almost twice daily which is sad ;-) ) with little issue. The only issues I have is from from
eliquid;one is a PG mostly, and has the consistency of water, the other VG which is not........ VG doesn't play well with the gauge needle you need to use (and sucks from a wicking perspective imo) but still pretty easy to use, no degraded performance.