On demand convection vaporizers sure have been the latest trend in the portable herb vape space. With cartridge pens taking over and gaining more market share due to their quick, easy and discreet delivery the race is on to make a portable dry herb vape that will deliver much like the trusty oil pen. While many significant differences exist between well designed dry herb vaporizers and cheap concentrate pens the on demand delivery is something we can all agree the customer is going after. With this thought in mind , many of the new dry herb vaporizers hitting the market have been: Portable, deliver on demand and utilize the convection method of heating. Today we are going to be looking at and comparing two of the heavy hitters: The GHOST MV1 and the HAZE Square Pro, two vaporizers that are yes , you guessed it , on demand portable convection vaporizers which can vape both dry herb and concentrates.