I can't help much, because I've never tried a battery from CigEasy or Mist-Stix, but I can tell you this, Steve's customer service is unparalled.  I've yet to have an order without an extra 
thrown in, and when one of my VK 
batteries broke, because I dropped it, Steve replaced it at no charge. 
So while I can't make a product comparison, as far as customer service goes, there is no comparison.
Runk