Provari is the best hands down and the grand sucks. A lot of people don't like the price but we'll worth it. And I'm tried of people having vamos saying there great come on people. The reason why all Chinese mods have variable wattage us because they can't handle a steady voltage. They will drop off like crazy fast. I used to be one of those cheap people I've had vamo zmax legend sid MVP and others. All a waste of money. My 2 provari always up to what ever I throw at it and my e juice taste better and my coils and heads last longer because it's not pulsating to get power. Trust me all the other mods doesn't put out the power you have it set on. Then they trick you and do variable wattage to hide there junk